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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Alpina 246 (Junghans J17)

Features
stem wind and set
sub second

Data
18.5''', Dm= 41.4mm, Do= 42.0mm
H= 5.0mm
(winding gear +0.1mm)
F= 0.6mm
T= 2.4mm
15 jewels
f = 18000 A/h
power reserve 34h

Balance staff U409
(riveted)

Stem W298

Mainspring / battery
Zf3495, 2.00 x 16.0 x 0.20 x 460mm

Hands
1.85 x 1.15 / 0.21mm

Comments about the data

Remarks
hunter calibre
bimetallic screw balance with riveted staff
Breguet hairspring

family:
monometallic screw balance:
226: open face*
226: hunter
bimetallic screw balance:
226: open face*
246: hunter
*) These calibres I've multiply seen, but not yet with the mentioned calibre number.

Example, year: signature; shock device
ca. 1925: 003683, Alpina, 226 - 3683
(Alpina 226)

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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