Nippon-Kogaku Nikkor 1:3.5 f=5cm Nr.502xxx
This appears to be the last, and rare variation of using the original 50xxx serial number block. These lenses are the first to feature a screw mount for Canon J rangefinders. The mount is similar to the 39mm Leica screw mount, but the thread has 24 turns per inch instead of 26 turns per inch, so they are not compatible.
- First lenses with Canon J screw mount.
- The aperture scale now marked with standard increments (3.5 - 4 - 5.6 - 8 - 11 - 16).
- The name-ring has also changed to "Nippon-Kogaku Nikkor 1:3.5 f=5cm Nr.xxxxxx" instead of the usual "Nikkor 1:3.5 f=5cm Nippon-Kogaku Nr.xxxxxx". A similar style is also found on the 5cm 1:2 Regno-Nikkor.
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