Diff of 512043 - Riquartz

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

Movement: Cal [[510]], quartz marked NDK74F (for Apr 1977)
Movement: Cal [[510]], quartz marked "NDK 74F" (for Apr 1977)

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