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stem wind and set
18.5''', Dm= 41.4mm, Do= 42.0mm
f = 18000 A/h
power reserve 35h
Balance staff U418
Mainspring / battery
Zf3641, 2.20 x 16.0 x 0.20 x 460mm
1.85 x 1.15 / 0.25mm
Comments about the data
open face calibre
until now only noticed difference between J33 and J33b: different alignment-pin diameters
variant with slightly modified train bridge for Alpina 245 (Fig.3, 4)
friction-fit balance staff, monometallic balance:
J31: 3/4 plate, flat hairspring
J32: 3/4 plate, Breguet hairspring
J33: bridges, Breguet hairspring, 15 jewels
J33a: bridges, Breguet hairspring, 7 jewels
J33b: like J33, production related differences
riveted balance staff, bimetallic balance:
J33c: bridges, Breguet hairspring
J34: like J33, production related differences
Ronda mentions for J31-J33 a friction-fit balance staff and a riveted, common is obviously friction fit.
Example, year: signature; shock device
1-2) ca. 1925: 123651, Junghans, 33b - 7593
3-4) ca. 1920: Alpina - 3446
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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