It's a Heuer 73633 (manual-wind 7736 movement) that has a blank dial which may have been a manufacturer blank at some point, perhaps headed for one of the private-label "poor man's" Monacos sold by Benrus or Dugena etc. - the hands may also be, but they're not for a Heuer. It's sort of like a "running project" if you will
😉 I'll probably take my time looking for a dial & hands, or may offer it to someone who feels like having some cheap fun with a Monaco! But for now I'm enjoying the crazy style of the vintage Monaco
😁