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Alpina 277 (Unitas 33)

Features
stem wind and set
sub second

Data
18.5''', Dm= 41mm
H= 4.15mm
15 jewels
f = 18000 A/h
power reserve 33h

Remarks
open face calibre

family:
273, 273A, 6525: open face, H= 5.3mm
274, 273A: hunter, H= 5.3mm
277: open face, H= 4.15mm
278: hunter, H= 4.15mm

Example, year: signature; shock device
ca. 1930: 55, 273
(Alpina 273, H= 5.3mm)

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