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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Bifora B12

quartz controlled pin lever
sweep second
day: set by +/-24h
date: quickset by turning the crown forth and back
hack feature

13''', Dm=Do= 29.35mm
H= 5.65mm
T= 2.9mm
5 jewels
f = 32768 Hz

Stem W3417

Mainspring / battery
313 (original, mercury), 357 (replacement, silver odixe)

1.40 x 0.80 x 0.24mm

Comments about the data

strange: There is neither a stepper motor nor a quartz-controlled balance, but a pin lever with inductor, which is actuated once per second.
The mechanic was taken to wide extent from the electronical predecessor B11, with the pin lever replacing the original balance.

B8: 8.25''', electrical*
B9: 13''', electrical*
B10: 8.25''', electronical
B11: 13''', electronical
B11: 13''', quartz
*) prototypes, never serielly produced

Example, year: signature; shock device
ca. 1975: Bifora

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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