Non working, need new balance wheel or parts of it. Strap more likely original stamped 750 for Platinium and Swiss. In this case Patek Philippe invented and created elusive “ Perpetual Machine “, 36 small diamonds set in platinum with a bit of light and right angle will light up the room, batteries no required . Working task, still looking for watchmaker who is up to tackle. My father in-law who was the type of watchmaker - if l cannot get it l make it- using lathe and other machinery and tools that he built or make himself. Unforeseen update, l misplaced or lost winding crown with Patek Philippe Logo, still looking fot it. Mitch