FED f2/50mm developed for FED S and FED B factory? .. transformed to Leitz Summar as were various FED transformed in Leicas. Probably 1940 years,
There are at least two versions: white or black front.
Registered serial numbers:
21488 _____ Jacques Morin collection (black)
22816 _____ Mike Haley- napchop (white)
23814 _____ David Tomlinson (white)
28869 _____ Bill Parkinson collection(white)
28957 _____ David Tomlinson (white)