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stem wind and set
18.5''', Dm= 41.4mm, Do= 42.0mm
(winding gear +0.1mm)
f = 18000 A/h
power reserve 35h
Balance staff U408 / U409
(press fit / riveted)
Mainspring / battery
Zf3495, 2.00 x 16.0 x 0.20 x 460mm
1.85 x 1.15 / 0.21mm
Comments about the data
bimetallic screw balance with riveted staff
option: monometallic screw balance with press-fit staff
in late samples setting-lever spring and click spring modified (Fig.1-3, cf. J15)
The balance with press-fit staff (even from the earlier J9) and with riveted staff are completely with hairspring interchangable.
J13: open face, 19'''
J14: open face, for Alpina with separate escape-wheel cock
J15: hunter, 19'''
J16: open face, 18.5'''
J17: hunter, 18.5'''
Example, year: signature; shock device
1-2) ca. 1925: 0418890, Junghans 17 - 4037
3) ca. 1925: 0428252, Junghans, 17
Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.
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