History of 570 (No. 23)

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  • 57 (2025-03-15 (Sat) 23:39:47)
  • 58 (2025-03-20 (Thu) 21:36:02)
  • 59 (2025-04-25 (Fri) 07:54:02)

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Quartz movement

• Introduced circa 1974
• White ceramic circuit, often marked “4”, "5”, "AA3", "AI3", “AK2", "AK3”, “AR3”, "AO4", "AA5", "AB5", "AH5", "AI5", "AL5", "AR5", "AS5"
• RCA 81473 LSI chip, date code in the form of xxxx, eg 7422 for 22nd week of 1974
• 10 Jewels
• Some are marked "Three 3 Adj."
• Some even have a movement serial number
• Battery 303
• Consumption 15 or 3 micro amps
• Some have a square to adjust rate & some a screwdriver slot
• Some have a shock proof setting on the rotor pivot
• Some have a large oval quartz can, some have a large cylinder
• Some have a more red coloured insulation on the coil

From thewatchforum.co.uk

"The first volume movement was the cal570, a conventional looking quartz movement, well executed and rather similar to its contemporary Orient cal52950 - perhaps a sign of cooperation or plagiarism between the two companies. Watches with this movement date from the start of 1974 to perhaps 1976."

http://hiiragi15.blog.fc2.com/blog-entry-3085.html

http://hiiragi15.blog.fc2.com/blog-entry-3086.html

http://www.crazywatches.pl/ricoh-570-dugena-riquartz-1974

Watches using this calibre†

• See List of watches

Example serial numbers†

• 010856 (Cover of Technical manual)
• Most movements do not have a serial number

Date code?†

570A†

• Fixed cap jewels instead of shockproof
• Oval quartz crystal can, attached to wheel bridge

571 & 572†

• Consumption 11 or 3 micro amps

     

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