History of 550001 (No. 37)

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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.

Launched Dec 1971 according to Ricoh manual rated 0.2s per day, 5s per month

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 unique barrel shaped acrylic
• Caseback/crystal combined gasket flat barrel shaped
• 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†

Excellent condition, original flexible bracelet

116565†

116633†

Restored 2024, original flexible bracelet

119050†

Almost as new condition, original mesh bracelet

??????†

Original bracelet

??????†

Original bracelet

     

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