History of 550004 (No. 28)

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  • 1 (2022-09-12 (Mon) 21:43:32)
  • 2 (2022-09-12 (Mon) 21:45:13)
  • 3 (2022-09-14 (Wed) 21:44:40)
  • 4 (2022-10-02 (Sun) 15:55:07)
  • 5 (2022-10-06 (Thu) 20:55:19)
  • 6 (2022-10-06 (Thu) 20:56:31)
  • 7 (2023-07-16 (Sun) 13:57:26)
  • 8 (2023-07-16 (Sun) 17:27:09)
  • 9 (2023-07-25 (Tue) 21:08:24)
  • 10 (2023-07-29 (Sat) 18:26:50)
  • 11 (2023-07-29 (Sat) 20:50:54)
  • 12 (2023-07-30 (Sun) 14:58:09)
  • 13 (2023-11-05 (Sun) 16:33:59)
  • 14 (2023-11-08 (Wed) 23:45:18)
  • 15 (2023-11-26 (Sun) 14:04:41)
  • 16 (2023-11-27 (Mon) 12:49:58)
  • 17 (2023-12-17 (Sun) 23:42:50)
  • 18 (2024-01-11 (Thu) 20:49:25)
  • 19 (2024-01-21 (Sun) 16:01:55)
  • 20 (2024-01-28 (Sun) 15:11:15)
  • 21 (2024-05-13 (Mon) 11:02:40)
  • 22 (2024-05-20 (Mon) 11:28:45)
  • 23 (2024-05-27 (Mon) 12:05:27)
  • 24 (2024-06-10 (Mon) 10:16:59)
  • 25 (2025-02-25 (Tue) 22:55:31)
  • 26 (2025-03-22 (Sat) 22:37:57)
  • 27 (2025-04-20 (Sun) 21:23:20)
  • 28 (2025-04-21 (Mon) 11:49:24)
  • 29 (2025-06-24 (Tue) 17:49:02)
  • 30 (2025-07-07 (Mon) 10:35:39)
  • 31 (2025-07-08 (Tue) 22:25:25)

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The later 550 watch, stainless steel only so far recorded.

Case†

• Stainless steel
• Case back secured by four screws

Dials†

• With or without stone at 12
• Apertures for day & date at 6
• Signed "Ricoh"
• Gloss black
• Silver
• Two tone silver
• Fading brown
• Blue

Parts†

• Battery 2x 303 in insulating sleeves
• Crystal round
• Crystal gasket
• Caseback gasket
• Crown gasket rounded rectangle
• Date corrector gasket

Example serial numbers†

Second digit "2"

325941†

622994†

822256†

822793†

822814†

822973†

823449†

823647†

825712†

825829†

??????†

??????†

     

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