Identify This Leica

The lens is a Summar. Agree on the IIIf.

+1

Its a late model SUMUS, a Summar in a non-rotating mount, without the f/2.9 tick mark for the antique Agfa color process. Summars have f/2.2 marked. Summitars and Summicrons don't. Also, Summitars have a deeper mount with a ~4mm wide knurled band.
 
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