Junghans J10, updated 12.09.2020
Junghans
Alarm pocket watch
1911 - 1921
Open face
J10
101
18,5'''
41.85mm
41,4 mm
7,8 mm
18000 A/h
54/66 h
U427, 427 ST
W773
Zf3923, 550 x 2,5 x 0,2 mm
Junghans mentions spring number
1009 515 x 2,55 x 0,205 mm
F.W.S 1942 page 47
3/5/7/11
98 gr
51 gr
Schramberg
The J10 was the replacement for the Junghans J5 in 1910 and the J10 was relaced by the J36 in 1923.
Kind:
Production:
Type:
Variants:
Catalog Group:
Size:
Outer Diameter:
Nominal Diameter:
Height:
f:
Power reserve:
Balance staff:
Stem:
Mainspring:
Reference picture:
Jewels:
Weight complete:
Weight movement:
Production site:
Pictures of the J10 movement #7616 above are courtesy of Ralf Hoffmann.
Picture of the J10 movement #110419 above is courtesy of Jens Weißler.
Part chart from 1913, courtesy of JUNGHANS GMBH & CO.KG
How to seperate J5 from J10 and J36.
The J10 bell to the right is marked with "Reichskrone". That is the only one I have seen so far and no other information about the usage of "Reichskrone" on Junghans watches or clocks is known. Picture courtesy of Ralf Hoffmann.