Looks like the case back should come off which you would do with a combination of razor/case knife. You can see the steel case back as the rest of the case is gold cap. What makes you think it is a front loader? It is very easy to damage the case doing this so, a watchmaker would be the best idea.
Looks like a 50s Omega to me with a 330 or 500 series calibre. Hard to tell if the dial is original through that crystal but, it doesn't look hopeful.
Regards, Chris
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