Junghans J13, updated 27.12.2019 - Helicopters, pocket watches, flight simulation, tools.

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Junghans J13, updated 27.12.2019

Junghans
Master watch
1914 - 1921
Open face
J13
19'''
42,9 mm
5,0 mm
18000 A/h
34 h
U408
W297
Zf3495
Engelkemper II 1966 page 182
15

Kind:
Production:
Type:
Variants:
Size:
Diameter:
Height:
f:
Power reserve:
Balance staff:
Stem:
Mainspring:
Reference picture:
Jewels:
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A new click spring like later in the J47. Should be around 1921.
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