Your medal appears to be similar to this one:
https://www.poinsignon-numismatique...e_46015.htmlHowever, the one listed there is given as 34mm and 17g (=0.59oz) and 0.920 fineness (approx. 22kt) -- giving it a bullion value of about $800. Note also that yours is marked above MEXICO and the one above is instead marked to the right of the thrower's left foot, with the number 1 and a privy.
If your medal is really 3.1 oz of "four nines" gold, it would have a bullion value around $4,135. I suspect that yours is, in fact, .9999 gold-plated (probably HGE/heavy gold electroplate) over a base metal, but testing would be needed to confirm that.
As to the issuer, I can find no information on either yours or the one listed on the website above, but France does seem to be the point of origin. The Greek lettering is OLYMPIA / ΟΛΥΜΠΙΑ.
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