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Bifora 91

 

Bifora 91Bifora 91

Description

The midsize Bifora cal. 91 was used a lot in the 60ies and 70ies. It was vailable in two versions, one with fully integrated, indirectly driven center second and the other with a decentral small subsecond. Both versions use the same plates.

Like many Bifora movements, this one uses a Bishock shock protection system. It can only be found in Bifora movements.

On the dial side, there's a yoke winding system.

Bifora 91 dial sideBifora 91 dial side

 

 Technical data

ManufacturerBifora
Caliber91
Number of jewels17
EscapementAnchor with pallets
BalanceNickel
Shock protection(s)Bidlingmaier (Bifora)
Balance cock directionclockwise
Hairspring studmoveable
Regulator typeHairspring key
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Third wheel, Center second pinion
Mainspring barrel
Winding mechanismyoke
Setting lever spring3 holes
FeaturesSCI
FunctionsHour, minute, second
Beats per hour18000
Size93/4'''
Production time1962 - 1980
Image in Flume Werksucher K3 18
Bifora 91BiforaBifora911962 - 19809 3/4''''''Bifora 9117 Jewels, 9 3/4'''''', 18000 A/h, SCI
Factsheet

 

Usage gallery

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