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Gilt bridges, 5 jewels
From thewatchforum.co.uk
"Ricoh also developed a range of unusual movements around 1976 - the cal510 is the best known, with two setting buttons as featured in my recent post on this forum. There was also a similar cal530 with a single setting button. And there was a cal(forgot the number - perhaps 520??) with the two setting buttons on the back - this movement seems to have been used in watches with two movements and two analogue faces together in a single watch head."
Button B (lower button) advances the time forward by one minute. Button A (upper button) sets the movement going after adjustment. In order to set the time back, pressing button B will stop the movement and after waiting a period of time the watch can be restarted with button A when the time is correct.
Battery 384
Consumption 1.3 micro Amps
Battery life in excess of 2 years
Accuracy 15 seconds per month
The anti-magnetic shield under the dial forms part of the mainplate and carries the upper jewels.
