Its a YDS3. 250 twin.
They did several vertions, an off road one. A single seater. Worth money yes, cost money to fix up, OH yes.
Worth it?
Speaking for myself if i found something like that yes.
As a collectable deffinately. Profit.?.........Doubt it unless you can do a lot of it yourself. Can't see you have it running cheap, esp if its siezed. Its all there though so it would make a real good progect.
If you have 5-600 (not too much engine nasty's) to throw at it you could have a nice original classic, leave anything that has aged with honest grace and fix the mechanical problems it WILL have and it could be a real cool ride.