NIKKOR-QC 1:3.5 f=5cm Nippon-Kogaku Tokyo No.705xxx

The last and most common of the collapsible 5cm 1:3.5 series. Serial numbers probably start at 7051 and continue to at least 70527xx. Most were made in Leica screw mount, unlike earlier series which use the slightly different Canon J screw mount. Some were also made in Nikon S rangefinder mount, so for the first time we have a Nikkor lens for a Nikon camera! Apart from that, this series follows on from the pervious versions with only minor changes:
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Lens with Nikon S mount, shown here with Nikon 1:

Leica screw mount version, with no hyphen in "Nippon Kogaku":