These have the Sachs 502/1a engine. Really neat little setup. Hard to price these sometimes since they fetch a decent little bit of change but finding the buyer can be tough. If you can get it for $100 that is a steal.
Parts aren't too tough to find overseas but pretty uncommon here. That one looks like it might be nicer than the one I have here. Mine is complete but from the limited photo, that one mine be in nicer shape looking just at the plastics. They are pretty prone to hazing over depending on how they were stored and those are still a pretty bright red.