It all depends on the model: hard to see - is it a 14381 or a 2852? While bracelets generally did not 'come' with Omegas of the time (except with certain gold pieces with designated bracelets), if your Constellation is a 14381, it may just scrape into the period of the Beads of Rice bracelet. If its a 2852, you'll find little evidence that bracelets other than generic examples offered at point of original sale were ever attached to this watch head.
Cheers
Desmond
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