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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Junghans J38

stem wind and pin set
sub second

18.5''', Dm= 41.25mm, Do= 41.85mm
H= 5.3mm
(winding gear +0.6mm)
F= 0.55mm
T= 3.0mm
3/10 jewels
f = 18000 A/h
power reserve 33h

Balance staff U420

Stem W299

Mainspring / battery
2.10 x 21.0 x 0.20mm

1.82 x 1.16 / 0.21mm

Comments about the data

open face calibre
indirect minute, hand friction clutch on barrel (Roskopf type, although with separate minute wheel)
stem mechanism between plates
if 3 jewels: balance with two bearing jewels and one cap jewel, lever with steel pallets

J38 : pin set
J38a: simplified J38 for Jota models
J38/1: set by pulling crown
J38a/1: simplified J38/1 for Jota models
J38c/1: set by pulling crown, different balance
J38/1: set by pulling crown, shock device

Example, year: signature; shock device
ca. 1930: Junghans, 38

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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