Junghans J15, updated 30.12.2022
Junghans
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Nominal Diameter:
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f:
Power reserve:
Balance staff:
Stem:
Mainspring:
Liftangle:
Jewels:
Hour hand:
Minute hand:
Seond hand:
Distance Center to Fourth wheel:
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Movement weight:
Reference picture:
Master watch
1914 - 1925
Schramberg
Hunter case
J15
106
19'''
43,6 mm
43,0 mm
5,0 mm
18000 A/h
34 h
U409
W298
Junghans mentions 3 different stems
with 23,75 mm, 25,4 mm
and 26,4 mm length
Zf3495, 460 x 16,0 x 2 x 0,20 mm
Junghans mentions spring
number 1002 465 x 2,0 x 0,20 mm.
38°
15
Ø 1,85 x 20 mm
Ø 1,15 x 14 mm
Ø 0,21 x 7 mm
11,7 mm
CW 33,9 mm
FW 22,5 mm
CW 30,7 mm
FW 49,0 mm
47,1 g
F.W.S 1942 page 18
Older type set spring.
Older type click spring and set spring assembly.
The later used click spring and set spring assembly.
This is the newer type set spring.
Below a new click spring like later in the J47. Should be around 1921. Also seen on the J13. Picture courtesy of Otto B.
J15
J15 Dial Feet Position