History of 510(No. 2)

History
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Gilt bridges

From https://thewatchforum.co.uk/index.php?/topic/95876-japanese-giant-goes-missing-ricoh-watches/

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.

Battery

History of 510 (No. 2)