Hasselblad 1960 C12(12ON) Film Back Magazine A12 (30015).

Fits all Hasselblad V-System bodies, from the earliest 500C to the latest 503CW. The 'C' film backs are easily distinguishable from the later 'A' backs as they have a little door in the rear to allow alignment of the film when loading. We find this door exceptionally useful for establishing unambiguously if there is film loaded!