Bulova produced two variations of the 10BA both modified from an ETA 900. There was a center second version from an ETA 926 which was renamed in 1952 to the more suitable reference 10BAC. In most (but not all) Bulova movement references a C denotes a center second – such as an 11BLACD or 11AFC.

The movement shown here is the sub-seconds variety.

Based on the ETA 900 ebauche with a modified balance. Other variations in the family included different bridge shapes and either Breguet or Flat Hairspring.


Manual wind with sub-second

7/15/17 jewels



Dm= 23.35 mm, H= 3.5mm, F= 1.3mm, T= 1.7mm

18,000 a/H Frequency

41 hour Power Reserve

Mainspring: 1.55 x 9.0 x .10 x 290mm

Hands: 1.40, .80, .22

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