Man's watch. Bifora Quartz with an electronic module and IC by Motorola. The stepping motor consists of a moving coil, that interacts with a multipole permanent magnet and makes one step per second. Most of the mechanical parts of the B12 are interchangeable with the B10, B11 and B20. The B12 movement can be found for instance in the Yema Quarz 10000.
| 1971 | The prototype is presented to the press. |
| 1973 | Commercial production is started. |
| 1975 | The B 20, ladies' caliber, is also used in the Yema Quartz CX. |
