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 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"
Serial no.†
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
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