This machine is an original Wankel powered model similar I would guess to the one in the Museum collection.
AD details indicate the following:
RD60793, Going, Sachs / Wankel engine, bull blade, booms spray, spare Wankel engine,
Price $ 2,500 Negotiable
Item location Churchill, VIC, Australia
It appears to be in very good nick for a piece of machinery dating from 40+ years ago. The Wankel motors were problematic but what you would do with that would depend on whether you are interested in preserving it as a collectors piece or putting it to work
The Ad is no longer current