Junghans timing watch, movement J29 - Helicopters, pocket watches, helicopter flight simulation and more.

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Junghans timing watch, movement J29

Junghans
Timing Watch
J29   1924 - 1929
J29a 1930 - 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

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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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J29 first edition
The operating lever spring is from an J29A, probably as a repair.
J29 second edition
The change is a new simpler operating lever spring and hammer spring.
J29a
Multiple parts have been simplified.
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J29/1
J29/II
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.
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The J29c is a J29a which was built from February 1944 for the German Navy as a special submarine hunting timing watch in an 71 mm case and with special dial illuminating as seen in the pictures.
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