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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Junghans J38a

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
1 jewel
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 / 0.22mm

Comments about the data

open face calibre
simple version of the J38 for the Jota models with steel pallets, only one jewel, imitated balance screws, and not gillt base plate
indirect minute, hand friction clutch on barrel (Roskopf type, although with separate minute wheel)
stem mechanism between plates

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, 38a

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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