It seems to be a lens for 16mm film, but my reference book states that it is for 35mm film.

Specification of DISTAGON 1.2/35mm  

Manufacturer   "OPTON" (Germany)
Lens system   -
Focal length f' 36.3 mm
Angle of view 2ω' 42°28'
Effective relative aperture f:nэ 1:1.4
Lens length Σd 79.4 mm
Front focal length S -
Back focal length S' 26.2 mm
Flange focal distance Z -
Block length B 88 mm
Block max. diameter D 76 mm
Rear diameter D' 41 mm
Front element diameter d1 48.3 mm
Rear element diameter d2 27.0 mm
Mount thread   -
Distance from rear end of the housing
to the focal plane
l 26 mm
Aperture blades quantity   ?
Frame size   16x22 mm
Weight   540 g





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