Latest Update: Nov 5, 2025

The Horolovar Guide is perhaps the most valuable reference available for repair of 400 day clocks. Starting as a selection guide for Horolovar suspension springs, it gradually expanded into a full reference for solving operating problems and identifying clock movements. Given that the latest edition of the guide was published over 30 years ago, it is a testament to its value that it is still the go to reference for most 400 day clock repair.

Starting with the 9th ed., 1984, an effort was made to tell the history of the clocks and identify the earlier manufacturers. In this area the guide falls short. The author/editors certainly used the most accurate information available at the time, but much research since then has shown a great volume of information was, at that time, unknown. Much of the new information is still yet to be published as a new work or even as a correction to the repair guide. There are also many holes in the history that are yet to be filled. The unfortunate result is that over the years the incorrect information in the guide is now taken as accurate. It seems unlikely that a revised edition of the guide will be published any time soon. For this reason it would be very useful to create a comprehensive errata document to address the known problems.

This document is not an attempt to create a complete revision. It is simply to correct the known errors. Some information not previously published in the Repair Guide will need to be included here, as several manufacturers of 400 day clocks were not known about when the 10th ed. was published.

The information provided here is derived from the independent research and hands on work with 400 day clocks performed by various individuals who have posted their findings and comments to this message board. Additional information is from other outside sources as noted.

This is a work in progress.

Contents

Note: This section of the guide has some interesting history that warrants further review. It is a good starting point, but there are several major inaccuracies that need to be addressed, along with a few typos.

Note: The most current and accurate histories of early torsion clock makers can be found in the appendix of Timely Memories, A Look at Anniversary Clocks, text by John Hubby, 2017, published by NAWCC Chapter 168.

Page 8, Column 2, para 3:

Change: "Zwitung" to "Zeitung"​

There is no evidence that Anton Harder had any contact or knowledge of the activities of Lorenz Jehlin until he applied for a patent for his own torsion clock in July 1878. Harder was denied the patent for a torsion pendulum but awarded No. 7543 for the design of his clock. Harder withdrew his patent request and his lawyers later acquired the rights to patent 2437 from Jehlin's estate in 1880.​

The firm Gershon Wintermantle and Co (GW & Cie), later Jahresuhrenfabrik (JUF), was started in Feb 1881 from a group of workers from the firm of Michael Bob after the owner's death in 1880. Wintermantle, August Schatz, and their two other partners purchased Bob's tooling and materials and set up shop in Triberg building weight driven regulators. In late 1881 another clockmaker working with Anton Harder, a Mr. Siedle, contacted The Wintermantle Co. to see if they could adapt the Graham escapement to the Harder clock. Wintermantle & Co. made torsion clocks for Harder, in addition to their own clocks, until 1883 when the Harder patents were sold to F.A.L. de Gruyter. Afterward they made only torsion clocks. The company changed their name to Jahresuhrenfabrik (Year Clock Factory) in 1884.​

Delete paragraph.​

The first 400 day clocks with pin pallet escapements and lantern pinions were made by the Andreas Huber Co. after 1911. The 3-ball pendulum (Section 13, pend 28) was also made by Huber.
Note: Badische did not make the 400 day clocks with lantern pinions that they sold with their logo or any of those with lantern pinions without their logo. They did make 400 day torsion clocks that used an inverted weight driven movement and a single ball pendulum with the adjustment weights hidden inside. An explanation and diagrams of their clock can be found in the 1904 Leipziger Uhrmacher Zeitung, No. 20, pages 312 to 313. The clock design was issued British patent No. 7059 on 28 Apr 1904 (see Section 4, item 20). The pendulum design was granted DRGM 218447 on 27 Jan 1904.​

Delete: Badische Uhrenfabrik, Phil Hauck, Andreas Huber, and Ideal Clock Co.​

Note: Badische Uhrenfabrik started making torsion pendulum wall clocks under British Patent No. 7059 in 1904 as stated above. They sold clocks made by Jahresuhrenfabrik and Philipp Hauck bearing their "Crescent B" logo during that same time. After 1915 they sold clocks using Huber lantern pinion movements, but they did not make the clocks.
Note: Uhrenfabrik Philipp Hauck of Munich made torsion clocks running 200 and 400 days from 1903 thru 1914.
Note: The Andreas Huber Co. under the leadership of Joseph Huber obtained control of Harder's US and British patents from de Gruyter. They sold clocks made by Jahresuhrenfabrik (JUF) under an agreement similar to JUF's prior agreement with de Gruyter. For a time Huber controlled a world wide monopoly on 400 day clocks. After the Harder patents expired, Huber assembled and sold clocks made by JUF, Hauck, and Kienzle all bearing their "Urania" brand either printed on the dials or stamped on the back plates. Huber made clocks of their own design with lantern pinions and dead beat or pin pallet escapements starting in 1912. These clocks are found marked with Badische, Kienzle, and Huber logos, and the names of various importers.
Note: The "Ideal" Clock Co. was the trade name for Wilhelm Würth & Co. of Schwenningen. Würth made 400-day clocks from 1903 thru 1910.​

Delete: Kieninger & Obergfell, and Wintermantel Uhrenfabrik​

Note: Kienninger und Obergfell (Kundo) began as a clock parts factory run by Johann Obergfell in 1899 in St. Georgen. Obergfell is credited with invention of the straight rod gong for clocks, DRGM 108469, in 1899. Obergfell partnered with George Kienninger in 1918 (forming Kundo) and began making 400 day clocks in 1923.
Note: Wintermantel Uhrenfabrik made 400-day clocks using JUF movements for several years begining in 1924.​

Change: "Phillipp Haas" to "Philipp Hauck"​

Note: Phillipp Haas & Söhne (PHS) did not make any 400-day clocks. All references to Phillipp Haas in this guide should be changed to Philipp Hauck.​

Add: Wilhelm Würth​

Change: "Jahresuhrenfabrik 1905 catalog" to "Jahres-uhr catalog"​

Pendulum guide cups were introduced by Kundo in 1933.​

Page 22, Column 1, para 1:

Change: "STRIKING" to "STRIKE"
After: "center of dial" Change: comma to a period and Delete: remainder of sentence.
Add: Movements were based on de Gruyter UK Patent No 3724 (not shown in guide).​

Para 2:​

Change: "Schneckenburger" to "Schnekenburger" (two places)
Note: The references to duplex escapements made by Schnekenburger in this paragraph are incorrect. Research has determined that duplex escapement clocks were made by Carl Bauer, a cousin to the patent holder J. Christian Bauer (see Section 4, item 15).​

Footnote 1​

Change: "1473" to "1473A"​

Footnote 2​

Delete​

Change: "1905" to "1910"
Change: "Jahresuhrenfabrik catalog for 1905" to "1910 Jahres-Uhr Catalog"
​

Note: Many of the clocks illustrated in this section were part of CharlesTerwilliger's personal collection. Those clocks were first shown with descriptions in Terwilliger's book The Horolovar Collection, published in 1962. Current research has shown that many of the descriptions of the clocks, and other information contained in the book are inacurate. Much of that information made its way into the current (1991) repair guide, errors and all. A look at The Horolovar Collection is useful in that it shows the back plates of the clocks where other identifying features can be seen and corrections can be made. For those who are interested, Horolovar Collection clocks will be called out with their number from that text. For example HC-1 would mean clock No.1 from the collection.

Page 33, Section 6 Tittle

Change "Pre-World War I" to "Pre-World War II"​

Note: This sections shows clocks made and sold before and after WWI, but before WWII.​

Clock 5​

Change: "unknown" to "GW & Cie"​

Clock 9​

Change: Plate "1475" to"1597"
Add: "HC-1"​

Note: Plate 1597 is the drawing of the actual plate for this clock, as can be seen in the Horolovar Collection.​

Clock 10​

Add: "HC-6"​

Clock 11​

Add: "HC-34"​

Clock 12​

Change: Plate "1055" to "1047"
Add: "HC-33"​

Clock 13​

Change: "Hass" to "Hauck"
Add: "HC-10"​

Clock 15​

Add: "HC-43"​

Clock 18​

Add: "HC-45"​

Clock 19​

Add: "HC-22"​

Note: This round movement with Plate 1631 has not been shown conclusively as having been made by JUF. Quite possibly Philipp Hauck is the maker.​

Clock 20​

Change: Plate "1617" to "1260"
Add: "HC-12"​

Note: Clock 20 lists plate 1617 which is an early numbered JUF plate (c1906). Fortunately this clock is number 12 from the Horolovar Collection, and in that book the correct plate can be seen as 1260. Clock 20 is also a marriage of the JUF movement and pendulum with the base from a Huber/Badishe (200/201 from the Badishe 1924-25 catalog).​

Clock 21​

Add: "HC-46"​

Note: The "1905 Jahresuhrenfabrik Catalog" referenced on these pages contains many clocks not made or sold by Jahresuhrenfabrik. The current belief is that the catalog is more likely a jobber's or wholesaler's catalog. Also the date associated with the catalog (1905) pre-dates by several years some of the items shown therein.​

Clock 46​

Add: "HC-32"​

Clock 47​

Change: Plate "1595" to "1617"
Add: "HC-29"​

Clock 48​

Add: "HC-20"​

Clock 49​

Change: "Unknown" to "Gebr. Junghans"
Add: "HC-38"​

Clock 50​

Add: "HC-24"​

Clock 51​

Change: "Jahresuhrenfabrik" to "Wilhelm Würth"
Add: "HC-11"​

Clock 52​

Add: "HC-18"​

Clock 54​

Add: "HC-8"​

Clock 56​

Change: "Kienzle Clock Factories" to "Wilhelm Würth"
Add: "HC-17"​

Clock 57​

Change: "Unknown" to "Wilhelm Würth"
Add: "HC-21"​

Clock 58​

Change: "Phillipp Haas" to "Philipp Hauck"
Add: "HC-28"​

Clock 60​

Add: "HC-16"​

Clock 61​

Change: "Kienzle Clock Factories" to "Wilhelm Würth"
Add: "HC-19"​

Clock 63​

Add: "HC-47"​

Clock 66​

Change: "Phillipp Haas" to "Philipp Hauck"
Add: "HC-26"​

Clock 67​

Add: "HC-44​

Clock 68​

Add: "HC-30"​

Clock 69​

Change: "Badische Uhrenfabrik" to "Kienzle Click Factories"​

Clock 70​

Change: Plate "1621" to "1415"
Change: "Unknown" to "Philipp Hauck"
Add: "HC-25"
Note: Plate 1415 is a drawing of the actual plate for this clock, as can be seen in the Horolovar Collection.​

Clock 71
Change: "Phillipp Haas" to "Philipp Hauck"​

Add: "HC-37"
Note: The pendulum shown with this clock is a Gustav Becker part, pendulum 29 on page 196, and is not original to this clock.​

Clock 72​

Change: Plate "1610" to "1051A"
Add: "HC-36"​

Clock 73​

Change: "Unknown" to "Jahresuhrenfabrik"
Add: "HC-27"​

Clock 75​

Change: "Kieninger & Obergfell" to "Schlenker & Posner"​

Clock 76​

Change: "Jahresuhrenfabrik" to "Philipp Hauck"
Add: "HC-23"​

Clock 77​

Add: "HC-39"​

Clock 78​

Add: "HC-41"​

Clock 79​

Add: "HC-42"​

Clock 80​

Add: "HC-40"
​

Clock 81​

Change: "Phillipp Haas" to "Philipp Hauck"
Add: "HC-35"​

Clock 82​

Add: "HC-15"​

Clock 83​

Change: "Phillipp Haas" to "Philipp Hauck"
Add: "HC-9"​

Clock 84​

Change: Plate "1009" to "1007"
Change: "Jahresuhrenfabrik" to "Philipp Hauck"
Add: "HC-31"​

Clock 85​

Add: "HC-14"​

Clock 86​

Note: This it the Schatz Jubilee clock for their 100th anniversary. Clocks were made by Kern and Sohne.​

Clock 87​

Change: Plate "1597" to "1599A"
Change: "Jahresuhrenfabrik" to "Philipp Hauck"
Add: "HC-7"​

Clock 88​

Change: "Phillipp Haas" to "Philipp Hauck"​

Page 70, Column 2, para 2, last sentence:

Change: "have not been identified" to "were granted to the Andreas Huber Co. in 1911 and 1912 for the use of lantern pinions and pin pallet escapements in torsion pendulum clocks."​

Plate 1007​

Philipp Hauck c1905-1906​

Plate 1007A​

Wilhelm Würth & Co.​

Clocks with this plate would have had serial numbers.​

Plate 1008​

Wilhelm Würth & Co. c1910​

Note: Clocks with this plate probably do not exist. The “MADE IN GERMANY” marking on this plate is not found with clocks bearing the Bowler & Burdick “Anniversary” stamps. Also the serial number is beyond the time that Würth provided clocks to B&B.​

Plate 1008A​

Wilhelm Würth & Co.​

Note: Clocks with this plate probably do not exist. The “MADE IN GERMANY” marking on this plate (ALL CAPS) is inconsistent with the serial number, and is not found with clocks bearing the Bowler & Burdick “Anniversary” stamps. This plate also has the same serial number as plate 1009. Bowler & Burdick clocks having the banking pins, shown on either side of the anchor depth adjustment, have been found but are otherwise marked identical to plate 1009.​

Plate 1009​

Wilhelm Würth & Co.​

Plate 1009A​

Wilhelm Würth & Co.​

Clocks with this plate would have had serial numbers.​

Plate 1009AA​

Wilhelm Würth & Co. c1907​

Plate 1015​

Andreas Huber Co. c1916​

Plate 1016A​

Andreas Huber Co. c1911-1915​

Plate 1019​

Andreas Huber Co. c1916​

Plate 1019A​

Andreas Huber Co. c1916​

Plate 1033​

Delete "Skeleton" before Disc Pendulum​

Note: BHA clocks with this plate were all created before pendulum #17 went into production. All would have had a #23 disk pendulum. (John Hubby)​

Plate 1041​

Andreas Huber Co. c1911-1915​

Plate 1043​

Philipp Hauck c1904-1906​

Plate 1049​

Wilhelm Würth & Co. c1903-1905​

Plate 1049A​

Wilhelm Würth & Co.​

Plate 1053​

Wilhelm Würth & Co.​

Plate 1055​

Philipp Hauck c1905-1906​

Plate 1056​

Philipp Hauck c1905-1906​

Plate 1150​

Gershon Wintermantle & Co.​

Plate 1172​

J. Christian Bauer c1901
DRP 120072​

Plate 1179​

Jahesuhrenfabrik c1911​

Plate 1189​

Add "or Skeleton Pendulum"​

Note: Clocks with this plate would have had either a #23 Disk pendulum or #17 Skeleton pendulum. (John Hubby)​

Plate 1251​

Andreas Huber Co.​

Plate 1251A​

Kienzle Clock Factories.
Note: This plate is the same layout as plates 1509 and 1547F.​

Plate 1257​

Note: This plate is covered by DRGM 588490 from 1914. Earlier clocks were marked as such.​

Plate 1259​

c1924-1927​

Plate 1260​

c1924-1927​

Plate 1263​

c1921-1923
Note: Serial number shown is out of range for JUF clocks. JUF produced less than 170,000 number clocks. First digit is probably a "1".​

Plate 1264​

c1923​

Plate 1265​

c1922-1924​

Plate 1267​

c1922-1924​

Plate 1303, 1307​

Carl Bauer c1896-1906​

Plate 1309A​

Note: This plate does not actually exists in this configuration. All Kaiser clocks with the narrow plates and horizontal anchor have two additional threaded holes above the lower post holes, like plate 1309, that are not shown on this diagram. The diagram for 1309 shows the holes as threaded. This plate diagram should have the same two lower threaded holes.​

Plate 1317​

Schlenker & Posner c1928
4-Ball Pendulum 37
Use .0035” (.089mm) Horolovar
No Appendix entry​

Plate 1318​

Andreas Huber Co.​

Plate 1384​

Andreas Huber Co.
Non-adjustable 4-ball pendulum 32
Appendix 96
Note: Plates 1384 and 1663 were used by Kienzle with the non-adjustable pendulum #32. The two screw holes to the right of the plate's centers are for the special suspension guard that slid down to capture the adjustable bottom block shown in appendix 96.​

Plate 1385​

Andreas Huber Co.​

Plate 1387​

Andreas Huber Co.​

Plate 1388​

c1939​

Plate 1415​

Philipp Hauck c1908-1913​

Plate 1419​

Philipp Hauck c1909​

Plate 1423​

Wilhelm Würth & Co.​

Plate 1425​

Philip Hauck c1906​

Plate 1427​

Wilhelm Würth & Co.
Delete: 4-ball pendulum​

Plate 1431​

Note: The two left most holes for the suspension guard rings are not threaded and should be open holes in this diagram.​

Plate 1436​

Note: This plate should have two unthreaded holes to the left of the two threaded suspension guard holes. This plate is the same as plate 1435 except for the serial number.​

Plate 1437​

Wilhelm Würth & Co.​

Plate 1438​

Wilhelm Würth & Co.​

Plate 1440​

Wilhelm Würth & Co.
Delete: 4-ball pendulum​

Plate 1441​

Philipp Hauck 1904​

Plate 1443​

Andreas Huber Co.​

Plate 1451​

Jahesuhrenfabrik c1911
This drawing is missing the upper plate pillars, see plate 1179​

Plate 1451A​

Jahesuhrenfabrik c1914
This drawing is missing the upper plate pillars, see plate 1179​

Plate 1459​

Philipp Hauck 1906
same as plate 1519​

Plate 1470E​

Wendez-Metzger​

Plate 1471​

Jahesuhrenfabrik c1898-1903
Most clocks with this plate were sold by Andreas Huber
Some movements have a different location for the click screw
Disk pendulum 21​

Plate 1472H​

Schlenker & Posner c1928
This plate is identified as “PS” but the logo stamp is actually an “S”
superimposed over a “P”
4-Ball Pendulum 37
Use .0035” (.089mm) Horolovar​

Plate 1473​

Carl Bauer c1896-1906​

Plate 1473A​

Carl Bauer c1896-1906
Note: Both plates 1473 and 1473A can be found with either bell striker or gong striker. Except for the difference in the serial number of these two plates, all the other makings are identical.​

Plate 1473B​

Carl Bauer c1896-1906
Note: This back plate is found with bell striker only and not with gong striker.​

Plate 1490​

Schlenker & Posner c1928
4-Ball Pendulum 37
Use .0035” (.089mm) Horolovar
No Appendix entry​

Plate 1505​

Schlenker & Posner c1928
4-Ball Pendulum 37
Use .0035” (.089mm) Horolovar
(19X38)
No Appendix entry​

Plate 1515​

Andreas Huber Co. c1926​

Plate 1519​

Philipp Hauck 1906
same as plate 1459​

Plate 1519A​

Philipp Hauck 1906​

Plate 1522D​

Philipp Hauck c1902-1903​

Plate 1527​

c1924-1927​

Plate 1529​

Schlenker & Posner c1928
4-Ball Pendulum 37
Use .0035” (.089mm) Horolovar
No Appendix entry (19x38)​

Plate 1547​

c1927-1939​

Plate 1551​

c1924-1927​

Plate 1559​

Schlenker & Posner c1928
4-Ball Pendulum 37
Use .0035” (.089mm) Horolovar
No Appendix entry​

Plate 1579AA​

Jahesuhrenfabrik c1924
Wintermantel Uhrenfabrik used JUF movements​

Plate 1595​

c1927-1939​

Plate 1595A​

c1927-1939​

Plate 1597​

Jahesuhrenfabrik c1888​

Plate 1599A​

Philipp Hauck 1902​

Note: This plate diagram is drawn about 60% larger than the physical clock it was taken from. The actual clock is shown on page 41, as clock 87. The clock is a miniature with a height of only 7.5", and is number 7 in the Horolovar Collection.​

Plate 1601​

Note: This plate should have two open holes to the left of the two threaded suspension guard holes.​

Plate 1602​

Note: The serial number for this plate is incorrect for the layout of the holes. The number should be higher than 151000. Clocks with this plate will have dimple marks to the left of the threaded suspension guard holes.​

Plate 1603​

Wilhelm Würth & Co.
Delete: 4-ball pendulum​

Plate 1607​

Philipp Hauck 1906-1914
3-ball pendulum, not 4-ball​

Plate 1610​

Philipp Hauck 1903-1905​

Plate 1613​

Wilhelm Würth & Co.
Delete: 4-ball pendulum​

Plate 1614​

Kern & Sohne
Schatz Jubilee clocks were made by Kern​

Plate 1621​

Jahesuhrenfabrik​

Plate 1623​

Junghans​

Plate 1626​

Wilhelm Würth & Co.​

Plate 1627​

Andreas Huber Co.​

Plate 1628​

Andreas Huber Co.​

Plate 1631​

Philipp Hauck​

Plate 1632​

Philipp Hauck c1907​

Plate 1633​

Gustav Becker​

Plate 1643​

Andreas Huber Co.​

Plate 1663​

Andreas Huber Co.
Non-adjustable 4-ball pendulum 32
Note: Plates 1384 and 1663 were used by Kienzle with the non-adjustable pendulum #32. The two screw holes to the right of the plate's centers are for the special suspension guard that slid down to capture the adjustable bottom block shown in appendix 96.​

Plate 1667​

Kern & Link 1929-1937
Kern & Sohne 1937-1950s​

Plate 1677​

Andreas Huber Co.​

Plate 1699​

Philipp Hauck c1906​

Plate 1717​

Andreas Huber Co.
Delete appendix 96​

Plate 1718​

Delete "73," after "See Appendix"
Note: This plate is for clock 64 on page 39​

Plate 1729, 1730 ​

Carl Bauer c1896-1906
Note: These two Plates are redundant as they are the same as plate 1473​

Page 180

Unit 10C​

12 Beats per Minute​

Unit 10D​

CHANGE: "made by Jahresuhrenfabrik" to "made by Kern and Söhne for Jahresuhrenfabrik,"
Same as Unit 11A​

Page 194, column 2, last para, first sentence,

CHANGE: "1912" to "the late 1920s for most manufacturers."
ADD: "The Schlenker and Posner Co. offered a disc pendulum option on at least one of their models between 1928 and 1936."​

Pend 6​

c1906
DRGM 276288
Also found with 4 large weights
Also found with no gallery​

Pend 7​

Wille/Würth c1903
DRP 144687​

Pend 8​

Andreas Huber Co. c1911
DRGM 453568​

Pend 9​

Andreas Huber Co. c1911
DRGM 453568​

Pend 10​

DRP 144688​

Pend 13​

Wilhelm Würth​

Pend 19​

Philipp Hauck c1904
5 column gallery shown
Also found with 6 column gallery​

Pend 20​

Wilhelm Würth c1903
Used with Würth clocks
Kronen Drehpendel​

Pend 23​

Shown 1st of 5 versions​

Pend 25​

Wintermantel Uhrenfabrik c1924
Plate 1579AA​

Pend 26​

Philipp Hauck c1911
DRGM 471231​

Pend 27​

c1924-1939
NOT temperature compensating
DRGMs 868673, 74, 75​

Pend 28​

Andreas Huber Co. c1912
First version of two​

Pend 32​

Kienzle Clock Factories c1915
Plate 1384, 1663
Non-adjustable
Uses adjustable bottom block​

Pend 33​

c1915​

Pend 34​

c1929
2nd version of Becker 4-ball​

Pend 36​

c1914
DRGM 589622​

Pend 37​

Schlenker & Posner c1928-1937​

Pend 38​

Used with Huber pin pallet movements​

Pend 39​

c1909-1950
DRGM 403658​

Pend 47​

c1933-1952
Note: There are two versions of this pendulum. The other version (not shown) has the same center ball finial as pendulum 35. Both versions are more commonly found with the Mayer Kundos from the 1930s, plate 1467.​

Pend 58​

Pendulum pictured is missing top locking disk, See Pendulums 68 and 90.​

Pend 97​

c1933-1952​

Page 202

Brackets 1-3​

Huber Std.​

Bracket 11​

Würth Std.​

Bracket 12​

Jahesuhrenfabrik Lunar
2nd version​

Bracket 14​

Würth Std. 1907 DRGM 302860
Used by Würth and Kienzle​

Bracket 15​

Huber “E” 1907 DRGM 319314
Used by JUF and Kienzle
JUF version shown​

Bracket 16​

Würth Std. 1907 DRGM 314710​

Bracket 17​

Hauck Std.​

Bracket 18​

Kienzle Std.​

Bracket 27​

Schlenker & Posner
1st version​

Page 212

Appendix 10​

CHANGE: Badische to Huber
ADD: plate 1384.
Note: It is not known if the statement in this appendix is even true, but now at least it identifies the right plates and maker.​

Appendix 63​

DELETE: first sentence
ADD: "The anchor pivot hole for this plate is integrated into the suspension bracket. Escapement adjustment is lost when the suspension bracket is removed. Care should be taken to note the position of the suspension bracket prior to removal."
ADD: after "tightened." See Section 7 for escapement adjustment.​

Appendix 96​

CHANGE: 1717 to 1384.​

Appendix 123, Unit 1​

Design B was used Just before and after WWII.​

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