History of 570(No. 5)

History
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Quartz movement

White ceramic circuit, often marked "AB5", "AR5"
RCA 81473 LSI chip, date code in the form of xxxx, eg 7422 for 22nd week of 1974
10 Jewels
Some are marked "Adjusted"
Some even have a movement serial number
Battery 303

From https://thewatchforum.co.uk/index.php?/topic/95876-japanese-giant-goes-missing-ricoh-watches/

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 plaigiarism 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

Watches using this calibre†

572005S

↑

Example serial numbers†

010856 (Cover of Technical manual)

↑

570A†

Fixed cap jewels instead of shockproof
Different quartz crystal can

History of 570 (No. 5)

Watches using this calibre†

Example serial numbers†

570A†