This movement is full of rust, but is still working and is still pretty reliable.
The Bifora 91/1 is available 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.
version with subseconds
Bifora 91/1 dial side, version with 15 jewels
|Number of jewels||15/17|
|Escapement||Anchor with pallets|
|Shock protection(s)||Bidlingmaier (Bifora)|
|Balance cock direction||clockwise|
|Regulator type||Hairspring key|
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Third wheel, Center second pinion
|Setting lever spring||3 holes|
|Functions||Hour, minute, second(ss)|
|Beats per hour||18000|
|Production time||1962 - 1980|
|Image in Flume Werksucher ||K3 18|
Bifora 91/1BiforaBifora91/11962 - 19809 3/4''''''15/17 Jewels, 9 3/4'''''', 18000 A/h, SCI(s)
Bifora ladies' watchBifora ladies' watch