History of 550001 (No. 12)

[ Front page ]   [ New | Page list | Search | Recent changes | Help | | Log in ]

• History
• View the diff.
• View the diff current.
• View the source.
• Go to 550001.
  • 1 (2021-01-17 (Sun) 17:45:53)
  • 2 (2021-02-04 (Thu) 23:45:54)
  • 3 (2021-02-20 (Sat) 09:14:17)
  • 4 (2021-02-20 (Sat) 08:40:56)
  • 5 (2022-09-13 (Tue) 21:25:28)
  • 6 (2023-07-29 (Sat) 20:38:04)
  • 7 (2023-07-30 (Sun) 12:14:08)
  • 8 (2023-07-30 (Sun) 12:33:29)
  • 9 (2023-08-10 (Thu) 15:24:02)
  • 10 (2023-09-30 (Sat) 21:38:21)
  • 11 (2023-11-01 (Wed) 23:21:33)
  • 12 (2023-11-05 (Sun) 11:43:03)
  • 13 (2023-11-05 (Sun) 23:41:21)
  • 14 (2023-11-07 (Tue) 23:31:06)
  • 15 (2023-11-11 (Sat) 23:43:10)
  • 16 (2023-11-11 (Sat) 23:43:49)
  • 17 (2023-11-18 (Sat) 16:07:53)
  • 18 (2023-11-26 (Sun) 13:46:49)
  • 19 (2023-11-30 (Thu) 05:00:45)
  • 20 (2024-01-11 (Thu) 20:48:32)
  • 21 (2024-01-15 (Mon) 12:36:54)
  • 22 (2024-01-21 (Sun) 23:20:51)
  • 23 (2024-01-21 (Sun) 23:21:43)
  • 24 (2024-01-28 (Sun) 15:28:28)
  • 25 (2024-01-29 (Mon) 13:15:18)
  • 26 (2024-02-22 (Thu) 23:07:04)
  • 27 (2024-03-09 (Sat) 23:27:38)
  • 28 (2024-03-10 (Sun) 17:01:57)
  • 29 (2024-03-24 (Sun) 22:10:30)
  • 30 (2024-05-13 (Mon) 11:04:35)
  • 31 (2024-05-27 (Mon) 12:12:04)
  • 32 (2024-05-27 (Mon) 17:08:39)
  • 33 (2024-06-10 (Mon) 09:20:49)
  • 34 (2024-08-03 (Sat) 21:17:49)
  • 35 (2024-08-21 (Wed) 12:00:59)
  • 36 (2024-12-01 (Sun) 19:27:32)
  • 37 (2025-03-14 (Fri) 20:35:58)
  • 38 (2025-06-24 (Tue) 17:49:02)
  • 39 (2025-07-22 (Tue) 21:50:16)

---

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

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.†

Parts†

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

     

Site admin: Riquartz -

PukiWiki 1.5.4 © 2001-2022 PukiWiki Development Team. Powered by PHP 8.3.24. HTML convert time: 0.006 sec.