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6.75 x 8''', Dm= 15.3 x 17.95mm
Do= 15.3 x 18.2mm
f = 18000 A/h
power reserve 40h
Balance staff U1236
Mainspring / battery
Zf1013, 1.40 x 7.5 x 0.08 x 250mm
1.10 x 0.60mm
Comments about the data
option: Breguet hairspring
Aurore-Villeret 120, Bulova 6AH, FHF 120 and the many variants of these calibres are quite equivalent. Exchangability data are contradictionary in the various movement registers. Therefore here only calibres are listed which are mentioned in several registers as derivatives of these base calibres, or which could be checked for equivalence.
The Bulova calibres have design details which are not present in the FHF calibres. So the ebauches came probably from Aurore-Villeret.
differences not known between 120...122, 122N, 124, 125, 127, 1220, 1221
Example, year: signature; shock device
1943: X (1943), BXW, Bulova Watch Co, 6AH, Swiss, 17 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.
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