NIKKOR-QC 1:3.5 f=5cm Nippon-Kogaku Tokyo No.610xxx

Yet another small batch, with 610xxs serial numbers probably starting at 6101 and continuing to at least 6104xx. All lenses recorded to date have the Canon J screw mount although Robert Rotoloni (Nikon Rangefinder System) reports one with a Nikon mount! Overall this series appears identical to the previous 570xxx series. I've only seen two lenses in this series with reports of two more, so if you know of more, let me know.
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