I think this one is a Frankenstein, but I could be wrong I believe the early constellations were 17J bumper watches, the 1st rotors were I believe 19J then they went to 24. Looks like a rotor on this one when it should have been a bumper so I think the movements off. Also when I look at the dial something seems off the seconds width seems inconsistent at the date, maybe a refinish dial? Its 37mm, at $299 dont know if it is worth it as a franenstein.
You will get a load of opinion on here if you want specific knowledge I would put it in front of a specialist who knows precisely what and where to look if you want to be sure OP.
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