Soviet Russian Lens A4 For Spy KGB AJAX-9/F21 camera 28mm f/2.8 #01988

The lens A4 f2.8/28 mm, very sharp, made in USSR, 1950-80'.The lens was mounted on a special camera AJAX-9/F21, which was used by the secret intelligence service of the KGB of the USSR.I think this lens was copied from the German Tessar 2.8/20. See the last photo and my listing of this lens.

Specification:
Diaphragm scale from 2,8 to 16
Focal length: 28mm
Focusing: fixed
Connecting thread:M27
Maximum diameter: 30mm
Length: 13mm
Weight: 20 gr
Serial number #01988
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