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View picture in original size
Fig. 1

View picture in original size
Fig. 2

View picture in original size
Fig. 3

Alpina 18'''H6.3 hunter

stem wind and set
sub second

18''', Dm= 40.05mm, Do= 40.8mm
H= 6.3mm
F= 0.7mm
T= 2.2mm
15/16 jewels
f = 18000 A/h
power-reserve 34h

Mainspring / battery
Zf3641, 2.20 x 16.0 x 0.20 x 460mm

1.80 x 1.02 / 0.30mm

Comments about the data

open face calibre
bimetallic screw balance
Breguet hairspring
lever and escape wheel anodized aluminium
Option: Reed's regulator (Fig.3)
early two-section regulator for coarse and fine adjustment (Fig.3)
steel bearing for stem (cf. Alpina 18'''H6.3 open-face)
two-part crown wheel with big bearing (cf. Alpina 18'''H6.3 open-face)
This detail is easy to recognise, because the crown-wheel screw head rotates during winding.
This screw is as else common left handed
Attention: The ratchet-wheel screw is also left handed
ebauche or even finished movement from Recta

The variants of open face and hunter with 18''' and 19''' have only base plates with different diameters.

Example, year: signature; shock device
ca. 1915: UH (Union Horlogère) - 55
(Alpina 19'''H6.3 hunter)

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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