History of 550003 (No. 20)

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  • 1 (2021-02-04 (Thu) 08:33:17)
  • 2 (2021-02-04 (Thu) 23:46:46)
  • 3 (2021-02-20 (Sat) 09:32:40)
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  • 40 (2024-05-27 (Mon) 12:50:54)
  • 41 (2024-06-04 (Tue) 20:32:53)
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  • 43 (2024-06-26 (Wed) 12:24:56)
  • 44 (2024-06-27 (Thu) 14:14:25)
  • 45 (2024-06-27 (Thu) 14:15:20)
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  • 47 (2024-07-08 (Mon) 15:01:10)
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  • 55 (2025-03-14 (Fri) 19:36:49)
  • 56 (2025-03-30 (Sun) 13:11:21)
  • 57 (2025-04-21 (Mon) 14:57:40)
  • 58 (2025-04-25 (Fri) 07:40:12)
  • 59 (2025-05-11 (Sun) 21:20:32)
  • 60 (2025-06-24 (Tue) 17:49:02)
  • 61 (2025-06-25 (Wed) 13:48:38)

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Slightly less accurate version of 550002 using the same 550 movement, rated at +-15 sec/month. Available in Stainless steel or gold plated, and with Tiger eye dial or painted.

Mentioned in the 1 August 1973 edition of the Japan Times newspaper, that Ricoh will start selling in late August of 1973.

Cal 550

Cases†

• Stainless steel
• Gold plated

Dials†

• Tiger eye
• Painted
  • Two tone silver

Prices†

• Stainless steel painted dial 59,000yen
• Stainless steel with Tiger eye dial 64,000yen
• Gold plated with Tiger eye dial 74,000yen

Parts†

• Battery 2x 303
• Crystal
• Caseback gasket
• Crown gasket
• Date corrector gasket

Book quotes†

"RICOH Ricoh Watch Co., Ltd. Head Office 2-24 Takatake-cho, Higashi-ku, Nagoya 461 (Yokota Building) | Tokyo Office 6-14-6 Ginza, Chuo-ku, Tokyo 104 (Ricoh San-ai Building) def . No 550003 SSW ¥ 59,000 052 ( 931 ) 6185 03 ( 543 ) 3784 His Majesty's great concern for all the people."

Example serial numbers†

1st digit 1 or 3, 2nd digit all 3, 3rd digit 3 or 4

So far all Stainless steel begin with 1, all Gold plated begin with 3.

     

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