UG made some flamboyant cases in their time, but nothing like this. To itemize things that are out of place:
1) dull case finish full of swirlies, different from the vast majority of steel Tri-Compaxes that are demonstrably original.
2) metal full of imperfections, similar to forged P-subs discussed in another thread (and explain to me how you get all the pitting on the bezel alone - it's not exposed to sweat. That's just poor casting).
2) screw back
3) waaaay too early for mushroom pushers based on case number
4) absence of perlage on inner caseback
5) obliterated last digits of case number and reference - just the ones that most obscure the origin of the piece
6) redial
So I see a legitimate movement, a repainted dial and a wholly forged case. I imagine movement and dial came from a gold watch that was scrapped.