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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Alpina 6525 (Unitas 31)

stem wind and set
sub second

18.5''', Dm= 41.1mm, Do= 41.65mm
H= 5.3mm
(winding gear +0.1mm)
F= 0.65mm
T= 2.3mm
15 jewels
f = 18000 A/h
power reserve 33h

Balance staff U1161

Stem W1681

Mainspring / battery
Zf3575, 2.10 x 16.5 x 0.20 x 490mm (catalogues)
Zf3568, 2.10 x 16.0 x 0.20 x 460mm (measured)

2.00 x 1.15 / 0.26mm

Comments about the data

open face calibre
attention: probably left handed ratchet-wheel screw
differences not known between 273, 6525

273, 6525: open face, H= 5.3mm
273, 274: hunter, H= 5.3mm
277, 6521: open face, H= 4.15mm
277, 278: hunter, H= 4.15mm
suffix A: meaning not known

Example, year: signature; shock device
ca. 1920: A, 273 - 140846 (Alpina)
(Alpina 273)

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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