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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

Bifora 91/1

manual wind
sub second

9.75''', Dm= 21.3mm, Do= 21.7mm
H= 3.4mm
(winding gear +0.4mm)
F= 0.55mm
T= 1.9mm
7/17 jewels
f = 18000 A/h
power reserve 44h

Balance staff U2912

Stem W2933

Mainspring / battery
Zf665, 1.20 x 8.5 x 0.095 x 265mm

1.40 x 0.85 / 0.22mm

Comments about the data

in later samples setting lever with pin instead screw, and minute wheel with pin (Fig.3, 4)
these parts can be used for older samples (Fig.1, 2), if the minute-wheel pin is removed from the plate, and/or a modified setting-lever spring is used

91: manual wind, sub second
91(SC): manual wind, sweep second
910: manual wind, sub second
910(SC): manual wind, sweep second
910(CLD): manual wind, sweep second, date
910(AUT): automatic, sweep second
910(AUT-CLD): automatic, sweep second, date
suffix /1: modified setting lever and minute wheel (transition floating)

Example, year: signature; shock device
1-2) ca. 1965: Bifora 91/1; Bifora-Bishock
(Bifora 91/1(SC))
3-4) ca. 1970: Bifora 91/1, Dugena 2003; Bifora-Bishock
(Bifora 91/1(SC))

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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