History of 550002 (No. 8)

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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)
  • 4 (2021-02-19 (Fri) 22:47:44)
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  • 8 (2022-09-13 (Tue) 21:36:01)
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  • 17 (2023-07-16 (Sun) 12:39:20)
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  • 37 (2024-01-28 (Sun) 15:00:29)
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  • 39 (2024-05-12 (Sun) 21:40:48)
  • 40 (2024-05-14 (Tue) 12:23:11)
  • 41 (2024-05-14 (Tue) 21:59:35)
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  • 43 (2024-05-20 (Mon) 13:46:59)
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  • 45 (2024-06-03 (Mon) 20:37:32)
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  • 47 (2024-06-07 (Fri) 20:47:16)
  • 48 (2024-06-12 (Wed) 18:06:33)
  • 49 (2024-07-22 (Mon) 09:04:22)
  • 50 (2024-08-05 (Mon) 11:24:43)
  • 51 (2024-08-21 (Wed) 11:58:50)
  • 52 (2024-11-26 (Tue) 20:17:26)
  • 53 (2024-12-09 (Mon) 22:47:21)
  • 54 (2024-12-20 (Fri) 13:29:54)
  • 55 (2024-12-20 (Fri) 23:10:54)
  • 56 (2024-12-23 (Mon) 23:13:09)
  • 57 (2025-01-20 (Mon) 16:56:21)
  • 58 (2025-01-20 (Mon) 16:59:30)
  • 59 (2025-01-23 (Thu) 15:14:13)
  • 60 (2025-02-23 (Sun) 12:25:52)
  • 61 (2025-03-03 (Mon) 12:59:35)
  • 62 (2025-03-13 (Thu) 23:39:16)
  • 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)

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

Example serial numbers - Case - Movement†

• Unknown - Stainless steel - Dated Z 1972, case only
• 122376 - Stainless steel
• 122797 - 022966 - Stainless steel - Dated Sep 1972, also marked B54AB
• 123148 - Stainless steel
• 123605 - Stainless steel
• 313709 - Stainless steel - Marked “550002 CA”
• 322389 - 015145 - Gold plated - Dated Aug 1972
• 323264 - 021906 - Gold plated, marked “550002 CA”, brown fade dial, gilt mesh bracelet

     

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