History of 550001 (No. 30)

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  • 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.

According to the 570 technical manual, it was revealed at the New York Hilton Watch & Jewelry show 25-28 July 1971.

Contrary to this, I have seen Seiko 3823 models with day-date with serial numbers dating to May & June 1971.

Cases†

• Stainless steel
• Gold plated
• Back held on by four screws and clamps
• Approx 15mm thick

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", note that Ricoh is not mentioned on the dial but on the caseback.

Prices†

• 118,000yen gold plated with strap

Battery procedure†

• Remove bracelet
• Remove four screws and four clamps
• Remove inner case containing movement from case
• Remove crown & stem by pressing tab
• Movement can now be carefully removed from caseback
• Negative connection (furthest from crown) should be disconnected, followed by positive
• Replace batteries in insulating sleeves
• Connect positive, followed by negative
• Insert into caseback
• Insert crown
• Insert into case
• Replace four clamps and screws
• Replace bracelet

Parts†

• Battery 2x 303 in insulating sleeves
• Crystal acrylic
• Caseback/crystal combined gasket
• Crown gasket 2x0.8mm
• Date corrector gasket 0.7x0.5x1.7mm G36768

Serial no.†

1st & 2nd digits all 1

115?3?†

115747†

115931†

116235†

116266†

116633†

119050†

??????†

??????†

     

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