History of 550002 (No. 23)

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  • 1 (2021-01-30 (Sat) 09:10:20)
  • 2 (2021-01-30 (Sat) 10:36:07)
  • 3 (2021-02-18 (Thu) 22:25:18)
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  • 63 (2025-03-23 (Sun) 12:10:07)
  • 64 (2025-04-11 (Fri) 21:16:16)
  • 65 (2025-04-25 (Fri) 07:42:29)
  • 66 (2025-05-06 (Tue) 10:53:12)
  • 67 (2025-05-07 (Wed) 21:18:38)
  • 68 (2025-05-21 (Wed) 20:29:21)
  • 69 (2025-05-27 (Tue) 20:55:39)

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Introduced about 1972, using calibre 550. Available in stainless steel or gold plated. Advertised in 1973 as the “Ricoh quartz crystal wrist computer, guaranteed accurate to 5 seconds a month ... miniature miracle ... guaranteed for two years” for $295 (the mechanical watches carried a ten year guarantee)

The 550002 features better accuracy than the 550003 (+-5 secs/month vs +-15 secs/month) despite using the same movement. There is a difference in cost reflecting this (¥93,000 vs ¥55,000)

Cases†

• Stainless steel - 93,000円 - $265 in 1973
• Gold plated - 118,000円 - $295 in 1973

Dials†

• White stone at 12, possibly a quartz
• Day & date apertures at 6
• Tiger eye
• Painted
  • Flat silver
  • Fading brown

Example serial numbers - Case - Movement†

     

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