NIKKOR-QC 1:3.5 f=5cm Nippon-Kogaku Tokyo NO.570xxx

Another new serial number block with numbers from 5703xx to 5711xx. Most of these lenses are seen mounted on Canon rangefinder but some also appear on Leica copies so it seems they were made in both Canon J and Leica screw mounts. The name-ring shows further developments, finally arriving at a format which would remain more or less standard during the Nikon rangefinder era:
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