Junghans J68, updated 04.01.2020 - Helicopters, pocket watches, flight simulation, tools.

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Junghans J68, updated 04.01.2020

Junghans
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f:

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Timing watch
1932 - 1937 (1945)
Open face
J68
20'''
41,4 mm
7,8 mm
1/5 sec. = 18000 A/h
1/10 sec. = 36000 A/h
U423/2110
W1819
Nr. 1030:
390 x 2,1 x 0,17 mm
Jacob 1948 page 41
4
38 g
92 g
53 x 74 mm
108/51, 108/52, 108/53
108/56

The production time is confirmed only until 1937, 1949 the J68 is not mentioned anymore in a catalog or pricelist. In the "Marine Dienstanweisung Nr. 2456 - Zeitmeßgeräte der Kriegsmarine" from January 1945 the J68 is mentioned with it's group index number 108/56 - f) Stoppuhren 1/5 Sek. (Zifferblatt mit 1/100 Minuteneinteilung), Fabrikat Junghans 108/56 - which implies that the J68 was built until 1945.

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Based on the J29 movement the J68 fits into J29 cases and vise versa. Also the dials will fit on both movements. Difference between the 1/5th and 1/10th second registering movements is the balance wheel which is much more massiv on the 1/10th version.
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108/52 Registering 1/10th seconds

Junghans J68
108/53 1/100 minute divison
This should also be the 108/56 according to the Marine Dienstanweisung Nr. 2456 - Zeitmeßgeräte der Kriegsmarine" from January 1945, registering 1/5th seconds with a 1/100 Minute division.

Later once have a extra stop mechanism for the center wheel.
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This J68 has no Junghans trademark on th movement.
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The following pictures are courtesy of F. Fügemann and showing a J68 timing watch for the German Navy.
On the dial you see a special artillery telemeter with hm unit, hm = hectometer = 100m, EU = Entfernungsunterschied (distance difference)
J68 copyright F. Fügemann
J68 copyright F. Fügemann
As this seems to be a late version of the J68 with its serial number 91286 some design changes are present. First the J29 balance wheel is used and the center wheel stop was changed.
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The following pictures are courtesy of F. Fügemann and showing a artillery-J68 timing watch with the center wheel stop function.
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Left the 1/5th second balance ring.
Diameter 15,5 mm height 0,74 mm.
Right the 1/10th second balance ring.
Diameter 15,5 mm height 0,37 mm.
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A handy hint by F. Fügemann was the Bergeon Presto 4 tool which makes accident free hand removal possible.
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