History of 550001 (No. 11)

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  • 49 (2026-04-30 (Thu) 22:09:45)

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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, revealed at the New York Hilton Watch & Jewelry show 25-28 July 1971, [although I have seen Seiko 3823 models with day-date from May & June 1971]. 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, silvered, or two-tone silver
• Signed "Riquartz, LSI [sine wave] 32768, Ricoh Japan"

Serial no.†

Parts†

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

     

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