Nikkor 1:3.5 f=5cm Nippon-Kogaku No.460xxx
This series has a new serial number block probably starting at 460001 and continuing to at least 4603xx. They look identical to the previous 502xxx series Canon J screw mount lenses, except the name-ring reverts back to the normal format. Within this series are some interesting developments:
- Early lenses have the serial number preceeded by "Nr" in the European style, like previous versions.
- By at least 460115 "Nr changes to "No" instead, in the American style. This would remain standard on Nikkor lenses until the early 1970s.
- Between 460209 and 219 lens coatings were applied for the first time, an important feature for improving contrast and reducing flare. The coating is indicated by a red dot "Nikkor • 1:3.5" on the name ring. These lenses have pinkish/amber reflections compared to the white reflections from the earlier uncoated lenses. Later coated lenses were marked with a red "C" instead.
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Early lens with "Nr" serial number:
Late lens with "No" serial number, and red dot and pink coating:
