Nikkor 1:3.5 f=5cm Nippon-Kogaku Nr.50xxx

Collapsible 1:3.5 5cm (50mm) lens for early Canon Hansa rangefinder cameras. It has the same styling and serial numbers as the 5cm 1:4.5 and 5cm 1:2.8 lenses, which suggests they were all made at the same time. Early lenses have a black face, but most have a chrome face. This series is similar to the original version but the name-ring has been updated:
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Early lens with black face:

Chrome face version: