Bifora 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 side
Technical data
| Manufacturer: | Bifora |
| Caliber: | 91 |
| Caliber base: | Bifora 91 |
| Size: | 9 3/4''' |
| A/h: | 18000 |
| lift angle: | 51.5° |
| Number of jewels: | 17 |
| Escapement: | Pallet lever |
| Balance types: |
Nickel anular balance |
| Shock protection(s): |
Bidlingmaier (Bifora) |
| Balance bearing / direction hairspring: | Clockwise |
| Moveable stud: | yes |
| Adjust mechanism: | Hairspring key |
| Construction: |
|
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 3 hole(s) |
| Features: |
|
| Production period: | 1962 - 1980 |
| References: |
Flume: K3 18 |
| Mentioning in literature (years): | 1962 - 1969 |
| Production years: | 1962-1980 |
Usage gallery
Ankra mens' watch