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Fig. 1

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Fig. 2

Alpina 6521 (Unitas 33)

stem wind and set
sub second

18.5''', Dm= 41.0mm, Do= 41.6mm
H= 4.15mm
15 jewels
F= 0.5mm
T= 1.9mm
f = 18000 A/h
power reserve 33h

Balance staff U1659

Stem W1418

Mainspring / battery
Zf3030, 1.50 x 16.0 x 0.19 x 490mm

2.00 x 1.15 / 0.26mm

Comments about the data

open face calibre
differences not known between hunter 277, 6521

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
1933: Alpina 277A - 264630
(Alpina 277A)

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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