History of 512043(No. 4) - Riquartz

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- 1 (2022-10-06 (Thu) 20:53:18)
- 2 (2023-04-10 (Mon) 20:28:36)
- 3 (2023-07-30 (Sun) 12:33:28)
- 4 (2023-11-10 (Fri) 22:41:05)

Case: Fluted Tungsten carbide, snap on case back, concealed lugs

Movement: Cal 510, quartz marked NDK74F (for Apr 1977)

See also https://thewatchforum.co.uk/index.php?/topic/95748-1970s-ricoh-strangeness/