1. Book
  2. Horolovar 400 Day Clock Repair Guide, 10th Edition, Errors and Updates

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 almost 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.

Section 1 History of the 400-Day Clock

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"​

Page 8, Column 2, last para:
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.​

Note: The best source of information on this subject is found in the article Jehlin's Two Patents & Harder's Own Story by Douglas K. Stevenson, NAWCC Watch & Clock Bulletin, Aug 2010.

Page 9, Column 2, para 2:
The firm Gershon Wintermantle and Co, later Jahresuhrenfabrik, was started in Feb 1881 from a group of workers from the firm of Michael Bob after the owner's death in 1880. Wintermantle, 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 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.​

Note: From the diary of August Schatz, Schatz 100 Years Jahresuhren-Fabrik GmbH Aug. Schatz & Söhne, A History of the firm 1881-1981.

Page 10, Column 1, last para:

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.​

Page 10, Column 2, first para:
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.​

Page 11, Column 1, para 6:
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​

Page 11, Column 1, para 7:
Change: "Jahresuhrenfabrik 1905 catalog" to "Jahres-uhr catalog"​

Page 14, column 1, para 3:
Pendulum guide cups were introduced by Kundo in 1933.​

Section 3 History of Striking 400-Day Clocks

Page 22, Column 1, para 1:
Change: "STRIKING" to "STRIKER"​
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
Page 23, Column 2:
Change: "1905" to "1910"​
Change: "Jahresuhrenfabrik catalog for 1905" to "1910 Jahres-Uhr Catalog"​
Note: More complete discussions of Strikers can be found in eleven articles written by Mun Chor Weng and published in The Torsion Times.

Section 9 400-Day Clock Back Plate Illustrations

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."​

Page 73
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.​

Page 74
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​

Page 76
Plate 1015
Andreas Huber Co. c1916​

Page 77
Plate 1016A
Andreas Huber Co. c1911-1915​

Page 78
Plate 1019
Andreas Huber Co. c1916​
Plate 1019A
Andreas Huber Co. c1916​

Page 82
Plate 1041
Andreas Huber Co. c1911-1915​

Page 83
Plate 1043
Philipp Hauck c1904-1906​
Plate 1049
Wilhelm Würth & Co. c1903-1905​
Plate 1049A
Wilhelm Würth & Co.​

Page 84
Plate 1053
Wilhelm Würth & Co.​
Plate 1055
Philipp Hauck c1905-1906​
Plate 1056
Philipp Hauck c1905-1906​

Page 95
Plate 1150
Gershon Wintermantle & Co.​

Page 97
Plate 1172
J. Christian Bauer c1901​
DRP 120072​

Page 98
Plate 1179
Jahesuhrenfabrik c1911​

Page 110
Plate 1251
Andreas Huber Co.​
Plate 1251A
Andreas Huber Co.​

Page 112
Plate 1259
Plate 1260
Plate 1263
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
Plate 1265

Page 113
Plate 1267

Page 114
Plate 1303, 1307
Carl Bauer c1896-1906​

Page 117
Plate 1317
Schlenker & Posner c1928​
4-Ball Pendulum 37​
Use .0035” (.089mm) Horolovar​
No Appendix entry​
Plate 1318
Andreas Huber Co.​

Page 125
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.​

Page 126
Plate 1388

Page 134
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​

Page 135
Plate 1437
Wilhelm Würth & Co.​
Plate 1438
Wilhelm Würth & Co.​

Page 136
Plate 1440
Wilhelm Würth & Co.​
Delete: 4-ball pendulum​
Plate 1441
Philipp Hauck 1904​
Plate 1443
Andreas Huber Co.​

Page 137
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​

Page 138
Plate 1459
Philipp Hauck 1906​
same as plate 1519​

Page 143
Plate 1470E
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​

Page 146
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.​

Page 149
Plate 1490
Schlenker & Posner c1928​
4-Ball Pendulum 37​
Use .0035” (.089mm) Horolovar​
No Appendix entry​

Page 150
Plate 1505
Schlenker & Posner c1928​
4-Ball Pendulum 37​
Use .0035” (.089mm) Horolovar​
No Appendix entry​

Page 151
Plate 1515
Andreas Huber Co. c1926​
Plate 1519
Philipp Hauck 1906​
same as plate 1459​
Plate 1519A
Philipp Hauck 1906​

Page 153
Plate 1522D
Philipp Hauck c1902-1903​

Page 154
Plate 1527
Plate 1529
Schlenker & Posner c1928​
4-Ball Pendulum 37​
Use .0035” (.089mm) Horolovar​
No Appendix entry (19x38)​

Page 155
Plate 1547
Plate 1551

Page 156
Plate 1559
Schlenker & Posner c1928​
4-Ball Pendulum 37​
Use .0035” (.089mm) Horolovar​
No Appendix entry​

Page 158
Plate 1579AA
Jahesuhrenfabrik c1924​
Wintermantel Uhrenfabrik used JUF movements​

Page 162
Plate 1595
Plate 1595A
Plate 1597
Jahesuhrenfabrik c1888​

Page 163
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​

Page 164
Plate 1614
Kern & Sohne​
Schatz Jubilee clocks were made by Kern​

Page 165
Plate 1621
Plate 1623

Page 166
Plate 1626
Wilhelm Würth & Co.​
Plate 1627
Andreas Huber Co.​
Plate 1628
Andreas Huber Co.​

Page 167
Plate 1632
Philipp Hauck c1907​
Plate 1633
Gustav Becker​

Page 168
Plate 1643
Andreas Huber Co.​

Page 169
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.​

Page 170
Plate 1667
Kern & Link 1929-1937​
Kern & Sohne 1937-1950s​

Page 172
Plate 1677
Andreas Huber Co.​

Page 175
Plate 1699
Philipp Hauck c1906​
Plate 1717
Andreas Huber Co.​
Delete appendix 96​

Page 177
Plate 1729, 1730
Carl Bauer c1896-1906​
Note: These two Plates are redundant as they are the same as plate 1473​

Section 10 400-Day Clock Suspension Spring Unit Identification

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​

Section 13 About 400-Day Clock Pendulums

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."​

Page 195
Pend 6
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​

Page 196
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
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​
Uses adjustable bottom block​

Pend 33

Pend 34
2nd version of Becker 4-ball​

Pend 37
Schlenker & Posner c1928-1937​

Pend 38
Used with Huber pin pallet movements​

Pend 39
DRGM 403658​

Page 197
Pend 47
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.​

Page 198
Pend 58
Pendulum pictured is missing top locking disk, See Pendulums 68 and 90.​

Page 200
Pend 97

Section 15 400-Day Clock Suspension Brackets and Saddles

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​

Section 18 Appendix

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.​

Page 217
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.​

Page 231
Appendix 96
CHANGE: 1717 to 1384.​

Page 235
Appendix 123, Unit 1
Design B was used Just before and after WWII.​

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