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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Junghans J43a

stem wind and set
sub second
hack feature

19''', Dm= 41.85mm, Do= 43.25mm
H= 4.5mm
F= 0.6mm
T= 1.8mm
15 jewels
f = 18000 A/h
power reserve 35h

Balance staff U388

Stem W324

Mainspring / battery
Zf3032, 1.50 x 16.0 x 0.21 x 440mm

1.60 x 0.85 / 0.27mm

Comments about the data

hunter calibre
bimetallic screw balance with 4 adjustment screws
Breguet hairspring
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
J42: hunter
J43: hunter, especially for Alpina 238
monometallic screw balance, staff pressed
J41a: open face
J42a: hunter
J43a: hunter, especially for Alpina 228
suffix /1: separate escape-wheel cock

Example, year: signature; shock device
1929: 01678, Alpina 238 - 1678
(Alpina 238)

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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