Label on the flywheel shroud says Mark Two 70, MF, and the height detent slots are steel. As it was a roadside find I've no idea of it's history but it appears to have not been fiddled with very much.
After doing a little run this morning I thought it was rather thirsty but realised I hadn't looked at the blades and it was on a much lower height setting than I usually use on our bush property. Sharpened the blades, set up some protection from flying sticks and stones, revised my fuel tank bodge and mowed about 2000 square metres, very reasonable fuel usage.
Somebody has put an "Advance Australia" sticker over the original label on the engine cover and I'm sure if I try to remove it the original will be damaged.