NIKKOR-Q·C 1:3.5 f=5cm Nippon-Kogaku Tokyo No.610xxx
Yet another small batch, with 610xxx serial numbers probably starting at 6101 and continuing to at least 6104xx. All lenses recorded to date have the Canon J screw mount although one (no.610316) was modified to Contax/Nikon S mount for Tom Abrahamsson. Overall this series is identical to the previous 570xxx series apart from some minor changes:
- The serial number reverts back to mixed case "No" in front of the serial number.
- Early samples retain the uppercase "K" in "KogaKu" and "ToKyo", later changing to lowercase.
- Retaining ring around front element with slots for a spanner wrench.
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