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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Bulova 7AK (ETA 735)

Features
manual wind
sub second

Data
7.75 x 11''', Dm= 17.55 x 25.0mm
Do= 17.55 x 25.4mm
H= 3.55mm
(cover plate +0.8mm)
F= 0.6mm
T= 1.6mm
21 jewels
f = 18000 A/h
power reserve 47h

Balance staff U1784

Stem W3148

Mainspring / battery
Zf873, 1.30 x 10.0 x 0.11 x 320mm

Hands
1.25 x 0.60 / 0.22mm

Comments about the data

Remarks
1936-1949
Breguet hairspring
option: cover plate and raised hands for strongly curved dial (cf. Bulova 7AP)
only partially based on ETA 735
differences not known between 7AA, 7AH, 7AK

Example, year: signature; shock device
1947: 47, Bulova Watch Co, U.S.A, 21 Jewels

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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