Vega-12 is a standard lens for medium format cameras such as Kiev-60 and Kiev-88. On these cameras, a 90mm lens is normal. Vega-12 was produced with two types of mounts - for bayonet B (for cameras Kiev-6C and -60) and B (for cameras Salut and Kiev-88).
Nowadays, variants of lenses with both mounts can be found with approximately equal frequency. In the review, Vega-12 with B mount and the type of mount is indicated in the marking - Vega-12B, which is not always the case. By the way, please note that the name of the lens is in Latin letters, and the mount type is in Cyrillic....