Gday Fxxxrr,
Your greenfield is indeed a model 1 (same as mine) lest the original engine which would have been a G40 Honda. Your Greenie looks to be in good shape and its fantastic that another early model is being preserved. I have a few questions, Would you be able to get a picture of the mower with the rear cowlings removed, specifically of the handbrake mechanism and what brand is that centrifugal clutch on the engine?
your model 2 greenfield would have come with a G65 Honda. Myself, PRD or GML may be able to help with bits for the model 2 depending on what your after however engine spares for the old Hondas are very scarce indeed.
Cheers
Greenfielder