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Fig. 1

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Fig. 2

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Fig. 3

Bulova 10BC (AS 1200)

manual wind
sub second

10.5''', Dm= 23.3mm, Do= 23.7mm
H= 3.5mm
F= 1.4mm
T= 1.7mm
7/15/17 jewels
f = 18000 A/h
power reserve 45h

Balance staff U2850

Stem W2788

Mainspring / battery
Zf1309, 1.60 x 9.0 x 0.1 x 290mm

1.40 x 0.65 / 0.20mm

Comments about the data

Breguet hairspring
only partially based on AS 1200

10BC: 10.5''', Breguet hairspring
10BS, 10BT: 10.5''', flat hairspring
10BU: 10.5''', flat hairspring, Kif-Flector
10ZC: 10.5''', flat hairspring, for Westfield
11AB: 11.5''', flat hairspring, Kif-Flector
suffix C: sweep second

Example, year: signature; shock device
1-2) 1951: L1, BXW, Bulova Watch Co, Swiss, 17 Jewels - AS
3) 1947: 47, BXW, Bulova Watch Co, Swiss, 15 Jewels - AS

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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