History of 550002 (No. 23)

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

• History
• View the diff.
• View the diff current.
• View the source.
• Go to 550002.
  • 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)
  • 5 (2021-02-20 (Sat) 09:38:27)
  • 6 (2021-02-20 (Sat) 21:57:03)
  • 7 (2022-09-09 (Fri) 21:08:19)
  • 8 (2022-09-13 (Tue) 21:36:01)
  • 9 (2022-09-13 (Tue) 21:37:36)
  • 10 (2022-09-15 (Thu) 13:11:00)
  • 11 (2022-09-15 (Thu) 15:16:27)
  • 12 (2022-09-18 (Sun) 21:28:02)
  • 13 (2022-09-19 (Mon) 19:47:15)
  • 14 (2022-09-22 (Thu) 21:44:16)
  • 15 (2022-10-01 (Sat) 07:33:58)
  • 16 (2022-10-07 (Fri) 21:33:29)
  • 17 (2023-07-16 (Sun) 12:39:20)
  • 18 (2023-07-16 (Sun) 17:33:00)
  • 19 (2023-07-19 (Wed) 21:02:56)
  • 20 (2023-07-29 (Sat) 18:26:12)
  • 21 (2023-07-29 (Sat) 21:25:40)
  • 22 (2023-07-30 (Sun) 12:50:58)
  • 23 (2023-07-30 (Sun) 13:20:43)
  • 24 (2023-11-03 (Fri) 23:20:18)
  • 25 (2023-11-05 (Sun) 23:25:59)
  • 26 (2023-11-09 (Thu) 23:50:08)
  • 27 (2023-11-16 (Thu) 13:23:57)
  • 28 (2023-11-26 (Sun) 13:34:12)
  • 29 (2023-11-26 (Sun) 22:44:03)
  • 30 (2023-11-27 (Mon) 12:55:06)
  • 31 (2023-12-08 (Fri) 12:41:04)
  • 32 (2024-01-07 (Sun) 12:25:44)
  • 33 (2024-01-12 (Fri) 18:45:38)
  • 34 (2024-01-15 (Mon) 12:38:08)
  • 35 (2024-01-21 (Sun) 16:42:21)
  • 36 (2024-01-21 (Sun) 23:32:35)
  • 37 (2024-01-28 (Sun) 15:00:29)
  • 38 (2024-05-11 (Sat) 21:22:33)
  • 39 (2024-05-12 (Sun) 21:40:48)
  • 40 (2024-05-14 (Tue) 12:23:11)
  • 41 (2024-05-14 (Tue) 21:59:35)
  • 42 (2024-05-18 (Sat) 21:24:20)
  • 43 (2024-05-20 (Mon) 13:46:59)
  • 44 (2024-05-21 (Tue) 21:17:55)
  • 45 (2024-06-03 (Mon) 20:37:32)
  • 46 (2024-06-04 (Tue) 20:28:58)
  • 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)
  • 70 (2025-06-24 (Tue) 17:49:02)
  • 71 (2025-10-01 (Wed) 22:15:28)
  • 72 (2025-11-02 (Sun) 14:23:45)
  • 73 (2025-11-02 (Sun) 14:24:28)
  • 74 (2025-11-27 (Thu) 23:08:40)
  • 75 (2025-12-07 (Sun) 13:10:04)
  • 76 (2025-12-29 (Mon) 12:38:14)

---

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†

     

Site admin: Riquartz -

PukiWiki 1.5.4 © 2001-2022 PukiWiki Development Team - pukiwiki.sourceforge.io. Powered by PHP 8.3.30. HTML convert time: 0.015 sec.