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:
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Early lens with "Nr" serial number:

Late lens with "No" serial number, and red dot and pink coating: