Greetings Lewis,
And a [belated] warm welcome to the ODK forums.

My family's OPE business was a Greenfield dealership from 1973-83, and I still think a lot of these machines.
We count some serious Greenfield aficionados among our members, and they have come up with some rather rare variants!
This one, for example; a Tractor series with electric start G80:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/75487/1.html