FED 50mm f/2 lens, developed for FED-S and FED-B, transformed to 'Leitz Summar'.

Only difference to the original FED-lens: the front engraving was changed to 'Summar 1:2 f=5cm E. Leitz Wetzlar', as various FED-1 cameras were transformed to fake 'Leicas'. Probably made around 1940.
There are at least two versions: white or black front.

Known serial numbers:

21488 _____ Jacques M. collection (black)

28597/8 ___ Jacques M. coll. (black)

28869 _____ Bill Parkinson collection(white)