History of 550001 (No. 10)

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  • 1 (2021-01-17 (Sun) 17:45:53)
  • 2 (2021-02-04 (Thu) 23:45:54)
  • 3 (2021-02-20 (Sat) 09:14:17)
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  • 20 (2024-01-11 (Thu) 20:48:32)
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  • 37 (2025-03-14 (Fri) 20:35:58)
  • 38 (2025-06-24 (Tue) 17:49:02)
  • 39 (2025-07-22 (Tue) 21:50:16)

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This is the first Ricoh quartz watch released around July 1971, the world's first quartz watch with day & date display. Using the newly developed calibre 550.

Cases†

• Stainless steel
• Gold plated
• Back held on by four screws

Dials†

• Day & date apertures at 6
• White stone at 12, possibly a quartz
• Gilt dial
• Signed "Riquartz, LSI [sine wave] 32768"

Serial no.†

Parts†

• Battery 2x 303
• Crystal
• Caseback gasket
• Crown gasket
• Date corrector gasket

     

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