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stem wind and set
18.5''', Dm= 41.45mm, Do= 42.2mm
(new: Dm= 41.4mm, Do= 42.0mm)
(new: dial collar +0.1mm)
f = 18000 A/h
power reserve 35h
Balance staff U408
Mainspring / battery
Zf3495, 2.00 x 16.0 x 0.20 x 460mm
1.85 x 1.14 / 0.21mm
Comments about the data
open face calibre
monometallic screw balance with press-fit staff
option: separate crown-wheel bridge (Fig.3)
early samples (Fig.1-2) like J8 with lever bridge, brass lever and -escape wheel
later (Fig.3-6) lever cock, steel lever and -escape wheel
further detail modifications during production periode cf. photos
The balance with press-fit staff and with riveted staff (of the later J13...J17) are completely with hairspring interchangable.
Example, year: signature; shock device
1-2) ca. 1910: 0007548, Junghans
3-4) ca. 1915: 0128351, Junghans - 8151, D
5-6) ca. 1920: 0291435, Junghans - 89 5
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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