I believe that this bracelet is most likely an aftermarket production.
Most gold Omega branded bracelets of the 50-60s are ones that were bought on the site of sale and were made by the local jeweller and sized to fit. A logo of the watch it was meant for was then soldered to the clasp. That's why there is only little in the way of adjustment in the clasp and no removable parts in the bracelet. An Omega bracelet would have appropriate markings in the clasp, most of the times including a bracelet ref. no.
I see these sell for the cost of gold when at auction.
FWIW, I am sure it will look great on a gold 50s Omega
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