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
Condition     Fair

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The Ad is no longer current