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Quartz movement
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
570 movement serial numbers seem to be rare.
The CMOS integrated circuit is made by RCA in America and is stamped 81473 followed by a date code. RCA were the first "outsiders" to make an IC for a quartz watch, they were followed by Motorola in early 1972. If you couldn't make your own IC, like Seiko did, an enormous undertaking, then you had to buy them in.
| Stamp | Case date | Chip date | Notes |
| 4 | Quartz cylinder>Shock proof & non-shock>Adj square | ||
| 5 | Quartz cylinder>Adj square | ||
| AA3 | Quartz cylinder>Adj square | ||
| AI3 | |||
| AK2 | |||
| AK3 | 570A>Oval quartz>Adj square | ||
| AR3 | |||
| AA4 | Cylinder quartz>Adj square | ||
| AO4 | Oval quartz>Adj square | ||
| AA5 | Oct 1975 | Cylinder quartz>adj square | |
| AB5 | chip dated 7422 | Cylinder quartz>Shock proof>Adj slot | |
| AI5 | |||
| AH5 | Apr & May 1975 | 570 & 570A>Cylinder & oval quartz>Adj slot | |
| AL5 | Oval quartz>Adj slot | ||
| AR5 | 570 & 570A>Oval quartz>Adj slot | ||
| AS5 |
