Hi!
As I've found it looks like most of later sandcasts went to Europe and pretty often in the german/dutch shape. It means with pilot lamp, small winkers, front winkers on 110 mm stems, a huge black taillightbracket with a round taillight and finally HM CB 750 stamped exhaustpipes with a quiter noiselevel.
I 've found this engine in south germany and bought it including both wheels, wrinkle tank, gauges and some other electrical parts.
Unfortunately it looks like the seller cant find the framenumber the engine came from.
Best regards to you all, Bo.