Junghans timing watch J29, last update 25.01.2019 - Helicopters, pocket watches, flight simulation, tools.

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Junghans timing watch J29, last update 25.01.2019

Junghans

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Junghans catalog 1927 text:
J29, Timing watch movement, 4 jewels, compensating hair spring, club teeth escapement, double safety roller

Junghans catalog 1934 text:
J29a, Timing watch, bridge movement, 4 jewels, compensating hair spring, club teeth escapement, double safety roller, gilt plates
Registering 1/5th seconds or 1/10th seconds.

Junghans catalog 1950 text:
Timing watch, bridge movement J29a, 4 jewels, Nivarox hair spring, pin pallet escapement, double safety roller, gilt plates
1/5th seconds division, 1/10th seconds division, 1/100 minutes division

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Timing Watch
J29 - 1924 - 1929
J29a - 1930 - 1950
J29/1 - 1950 - 1953
J29/II - 1950 - 1953
J29a/II - 1950 - 1953
Open face
J29 1st. and 2nd version
J29a, J29/1, J29/II, J29a/II
108
18,5'''
42,5 mm
41,4 mm
7,8 mm
1/5 sec. = 18000 A/h
1/10 sec. = 36000 A/h
U425, 428, 1742st
W1723, 1756
Zf 2,1 mm x 13,5 mm x 0,13 mm
Junghans mentions spring # 1005
515 x 2,15 x 0,13 mm
F.W.S 1952 page 46
43g
78g


J29 first edition
The operating lever spring is from an J29a, probably as a repair.
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J29 second edition
The change is a new simpler operating lever spring and hammer spring.
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J29a
Multiple parts have been simplified.
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J29/1
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J29/II
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J29a/II
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Here is a J29 timing watch with a tachymeter scale for 200 meters. If you follow a runners 200 m race and the runner finishes after 20 seconds you can read the average speed for the race was 36 km/h.


The following pictures are courtesy of F. Fügemann and showing a J29a movement signed with Löbner Berlin as well as the dial. The main plate is slightly modified. The history of "Uhrenfabrik F. L. Löbner" in Berlin is generally known, but this seems to be a rare find by Mr. Fügemann.
(C) F. Fügemann
(C) F. Fügemann

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The J29C is a restamped J29a which was built from February 1944 for the German Navy as a special submarine hunting timing watch in an 71 mm case. The following pictures are courtesy of F. Fügemann. The watches with the "U-Jagd" stamp on the dial sofar have serial numbers in the 93xxx to 97xxx range.
A little more explination about the dial you can find here: http://www.knirim.de/a0501mod.htm
J29C copyright F. Fügemann
J29C copyright F. Fügemann
J29c copyright F. Fügemann
J29c copyright F. Fügemann

According to special specifications the watch was available with special dial illuminating.
J29C copyright F. Fügemann
J29C copyright F. Fügemann

A dial seen without the "U-Jagd" signauture has a normal J29a movement with a 20xxx serial number. A prototype? Maybe? Pictures courtesy of Stefanovic Viktorija.
J29a copyright Stefanovic Viktorija
J29a copyright Stefanovic Viktorija
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