Orion 1a.
Very big and interesting lens.
It was used for air photography, topography, and recognizance. Lens was part of camera AFA 33/20. It make 300mmx300mm pictures, 92 degree angle.
F=200mm, 1:6.3,
Lens was included in 1949 KMZ catalog.
http://www.zenitcamera.com/catalog/catalog-lenses-1949.html
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