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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 extremely 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.
A circuit has come to light with a different IC, marked with Hitachi style date code 5L for .
Some movements are marked Three 3 Adjustments, presumably position, temperature & ?
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.
The early circuit. The late circuit.
The white ceramic circuit often has a code printed on it, possibly a date code.
| Stamp | Case date | Chip date | Quartz date | Circuit | Notes |
| 4 | Aug 1974 | 344 | 1 | Quartz cylinder>Shock proof & non-shock>Adj square | |
| 5 | May 1974 | 41 | 1 | Quartz cylinder>Adj square | |
| AK2 | Feb 1976 | 5 16 | 56 | 1 | 570A>Oval quartz>Adj square |
| AO2 | Aug 1975 | 7504 | 53 | Oval quartz>Adj square>Mvmt number>Adjusted | |
| AA3 | 48 | 1 | Quartz cylinder & oval>Adj square | ||
| AI3 | |||||
| AK3 | 1 | 570A>Oval quartz>Adj square | |||
| AR3 | |||||
| AA4 | Oct 1974 | Cylinder quartz>Non shock>Adj square | |||
| AA4 | Dec 1975 | 7421 | 47 | Cylinder quartz>Shock jewel>Adj square | |
| AO4 | 1 | Oval quartz>Adj square | |||
| AA5 | Oct 1975 | 1 | Cylinder quartz>adj square | ||
| AB5 | Jan 197 | 7422 | 1 | Cylinder quartz>Shock proof>Adj slot | |
| AH5 | May 1974 Apr May 1975 | 2 | 570 & 570A>Cylinder & oval quartz>Adj slot | ||
| AI5 | |||||
| AL5 | 1 | Oval quartz>Adj slot | |||
| AR5 | 2 | 570 & 570A>Oval quartz>Adj slot | |||
| AS5 |
Same basic design, with a few construction differences
