History of 550001 (No. 49)

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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. 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 accurate 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
• Blue-white stone at 12
  • Gilt
  • Silvered
  • Two-tone gilt
  • Two-tone silver
• Different hour markers between flat & two-tone dials
• Signed "Riquartz, LSI [sine wave] 32768, [Riquartz logo], Ricoh Japan", note that Ricoh is mentioned on the dial in miniscule text, but clearly 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 PW356
• Caseback/crystal combined gasket flat barrel shaped PK13B
• Crown LW169S or G for gold
• Crown gasket 2x0.8mm
• Date corrector pusher LW189S or G for gold
• Date corrector gasket 0.7x0.5x1.7mm G36768

Serial no.†

1st & 2nd digits all "1"

115?3?†

115747†

115808†

115924†

115931†

1160970†

• Seven figure serial no., presume extra zero suffix
• Red seconds hand
• As new condition
• Very, very early production with early circuit

116235†

116266†

Excellent condition, original flexible bracelet

116561†

116565†

116633†

Restored 2024, original flexible bracelet

119050†

Almost as new condition, original mesh bracelet

??????†

Original bracelet

??????†

Original bracelet

     

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