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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Alpina 311 Curvex

Features
manual wind
sub second

Data
7.75 x 11.75''', Dm= 17.65 x 26.4mm
17 jewels
f = 18000 A/h
power reserve 40h

Balance staff U2415

Stem W2162

Mainspring / battery
Zf665, 1.20 x 8.5 x 0.093 x 265mm

Hands
1.22 x 0.66 / 0.16mm

Comments about the data

Remarks
1935-1937
(Alpina Gruen Gilde 1929-1937)
first Curvex calibre
bimetallic screw balance, Breguet hairspring
Conoruma is Gruen's proprietary alloy for hairspring and balance with low temperature dependence

Example, year: signature; shock device
1937: 310608, Gruen Watch Co, Precision, Switzerland, Coronuma Hrsp. & Bal., 17 Jewels
(Gruen 311)

© R. Zeller

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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