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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Alpina 228 (Junghans J43a)

Features
stem wind and set
sub second
hack feature

Data
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 U387

Stem W324

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

Hands
1.60 x 0.85 / 0.27mm

Comments about the data

Remarks
1929-
hunter calibre
monometallic screw balance
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.

family:
monometallic screw balance, staff pressed:
227: open face
228: hunter
bimetallic screw balance, staff riveted:
238 hunter

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.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft


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