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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."
From Electrifying the Wristwatch "The Riquartz 570 caliber with 10 jewels and day/ date display was introduced in 1973; the dimensions were 27.0 mm x 5.50 mm. European customers were Nivada in Switzerland and Dugena in Germany."
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.
The date code is four digits, first pair are the year, second pair are the week, for example 7324 is 24th week of 1973.
Earliest recorded IC marked 7324 for 24th week 1973.
Earliest movements feature the same shock setting on the rotor jewel as the 550 with a rotating spring (although the 550 only had one on the lower pivot, the 570 has one on both pivots). Then they moved to a lift up design. Late movements had fixed cap jewels.
| 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 | Dec 1975 | 7421 | Cylinder quartz>Shock jewel>Adj square |
| AO4 | Oval quartz>Adj square | ||
| AA5 | Oct 1975 | Cylinder quartz>adj square | |
| AB5 | 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 |
