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stem wind and set
19''', Dm= 41.85mm, Do= 43.25mm
f = 18000 A/h
power reserve 35h
Balance staff U388
Mainspring / battery
Zf3032, 1.50 x 16.0 x 0.21 x 440mm
1.60 x 0.85 / 0.27mm
Comments about the data
bimetallic screw balance with 4 adjustment screws
The Junghans J43 with separate escape-wheel cock was after Junghans made especially for Alpina (Alpina 238), and from the real world also the Alpina 228 with monometallic balance is known, which would have the according Junghans designation J43a. It is uncertain whether these calibres were also applied in Junghans watches.
bimetallic screw balance, staff riveted
J41: open face
J43: hunter, especially for Alpina 238
monometallic screw balance, staff pressed
J41a: open face
J43a: hunter, especially for Alpina 228
suffix /1: separate escape-wheel cock
Example, year: signature; shock device
1929: 01678, Alpina 238 - 1678
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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