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@madlilkat
Splendid watch - congratulations.
Both Omega and their local affiliates produced these fixed bracelet Constellations.
(They generally had their own reference number but were based on an existing reference)
The case doesn’t look like a local English or French production - so is most likely Swiss.
It looks like a gold dial - so we refer to it as a ‘deluxe’ Constellation.
These fixed bracelet watches were also custom made by jewellers by removing lugs and adding a bracelet.
The watch is a strange one for a couple of reasons.
It has the case back shape of a 168.004 (without the lugs).
However, the indices style suggest a later reference and the both slanted and straight Ms in the text were never seen on an .004.
The bracelet would usually have an Omega symbol hallmark on the clasp.
The only way to get accurate information is to have the back (very carefully) removed by a competent watchmaker.
One of the issues with these watches is that the bracelet is made to fit the original owner and has to be irrevocably altered to fit a new owner.
Here is a 1974 Omega advert for a similar watch (although I would suggest that your watch is slightly earlier - like late 60s)
Hope that helps.
