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 Fig. 1  Fig. 2 | Bulova 6BS (Aurore-Villeret 120) Features manual wind Data 6.75 x 8''', Dm= 15.3 x 17.95mm Do= 15.3 x 18.2mm H= 3.4mm F= 0.8mm T= 1.7mm 17 jewels f = 18000 A/h power reserve 40h Balance staff U2817 Stem W2083 Mainspring / battery Zf928, 1.35 x 7.5 x 0.08 x 250mm Hands 1.10 x 0.60mm Comments about the data | Remarks Breguet hairspring like 6AH, but balance modified 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 6BD, 6BK, 6BL, 6BO, 6BS Example, year: signature; shock device ca. 1940: BXW, Bulova Watch Co, 17 Jewels (Bulova 6AH) 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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