Nice piece! It looks to be from the 50s or 60s but I'm not enough of a Constellation collector to say much from the dial/case. Better pics would help (what do the dial and caseback say?). And a pic of the insides (the movement) would be peachy keen! (old American slang for really nice).
That it still runs is wonderful. But it won't keep running if you don't service it before using... the lubrication is not working well anymore.
It is a constellation C model, likely to be from 1966/67 or later, solid gold with integrated solid gold bracelet. It will have a 561 or 564 movement. If pulling and pushing the crown changes the date it is a 564.
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