I really like these and am seeking one currently. When I say 'these' I mean watches usually from the lesser Swiss manufacturers using the Felsa 693 Bidynator movement. I believe these are usually 1950s (and maybe early 60s). Breitling used the movement, but mostly it featured in more obscure names like: Nivada; Keystone; Trematic; Opera; Record; Enicar; Vulcain; Calvan. I have seen both 21 and 25 jewel versions.
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