Quartz movement
- Introduced circa 1974
- White ceramic circuit, often marked “4”, "5”, “AB5", "AR5", “AH5”, “AO4”, “AR3”
- 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
- Consumption 15 or 3 micro amps
- Early models had a square to adjust rate, a shock proof setting on the stator pivot, an oval shape quartz can as opposed to the cylinder, and a more red coloured insulation on the coil
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
http://www.crazywatches.pl/ricoh-570-dugena-riquartz-1974
Watches using this calibre†
Example serial numbers†
- 010856 (Cover of Technical manual)
- Most do not feature a movement serial number
570A†
- Fixed cap jewels instead of shockproof
- Oval quartz crystal can, attached to wheel bridge
571 & 572†
- Consumption 11 or 3 micro amps
![[PukiWiki]](image/pukiwiki.png "[PukiWiki]")
