Junghans Alarm Pockewatch, movement J10 - Dirk E. Fassbender

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Junghans Alarm Pockewatch, movement J10

Junghans
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Reference picture:
Alarm pocket watch
1911 and 1914
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

This is a Junghans alarm pocket watch from 1911 or 1914. According to information from Junghans the watch was only produced in this two years. A hing pin was broken and a toothwheel is missing one tooth but the watch works fine. The movment has 7 jewels and the sound of the alarm can be adjusted with a small srew on the hammer. The ring goes for 12 seconds. The J10 calibre was the replacement for the Junghans J5 alarm calibre and the J10 was relaced by the J36 alarm calibre.

Junghans price list 1914 text:

7 jewels, flat hairspring, above
11 jewels, flat hairspring
15 jewels, compensation breguet hairspring

Alarm ca. 8 seconds
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Part chart from 1913, courtesy of JUNGHANS GMBH & CO.KG
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