Hi Nicholas,
Well if the ID plates are anything to go by then the rest of the machine is going to be an easy task for you.
BTW your primary clutch looks to be in superb condition as does most of the rest of the mower. You should be able to get the frame and associated panel work blasted and then simply repaint as you don't seem to have any chassis fatigue as many other machines of this age are suffering from.
I gather you are going to repaint in the same colour again ? if so before you get the blasting done go to the paint supplier you are going to use and get the colour matched up to the inside of the chain case as that will be your most original un-faded painted to work from.
So far so good.
Cheers,
BB