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View picture in original size
Fig. 1

Dugena 712 (Bifora 91)

Features
manual wind
sub second

Data
9.75''', Dm= 21.3mm, Do= 21.7mm
H= 3.4mm
(winding gear +0.4mm)
F= 0.55mm
T= 1.9mm
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

Hands
1.40 x 0.85 / 0.22mm

Comments about the data

Remarks
1962-

family/generations:
710: 9.75''', sweep second
712: 9.75''', sub second
1149: 11.5''', sweep second, date
modified setting lever and minute wheel:
2003: 9.75''', sweep second
2008: 9.75''', sub second
2009: 11.5''', sweep second, date

Example, year: signature; shock device
ca. 1962: Bifora 91; Bifora-Bishock
(Bifora 91(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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