Looks like someone has engraved Heuer on the bridge of a 7734. The lume on the dial looks very old but that Heuer logo looks too big for the watch, so I'm going to have to assume it's a redial or some after-market concoction. Case, crown and pushers don't look like Heuer to me. And you don't tend to see Incabloc engraved on factory Heuers either.