I’ve been waiting for one of these to come along for about 5 years at the right condition/price point. It is powered by a Valjoux 7734, early ones without a date have the Valjoux 23, slightly later a 7733.

Roamer Chrono-Diver – MOD: 734.9120.900

Just a few quick snaps:

Crown guards – crisp and sharp (these are often worn and dented – I doubt this watch saw much wrist time).  For such a chunky watch it has a very slim profile and feels just right on the wrist.

Strap was temporary – you can see the proper factory bracelet in the previous photo. Image from the 1972-73 range catalogue

When it arrived the crystal was very scratched – but as nothing else is damaged/worn I wonder if it had been stored in a drawer face down…