Thanks guys, it is as original as it looks and so far I have only found one modification, which is on the wiring and easily sorted. It is great working on this tractor as all the nuts and bolt are easily removed, set to the right torque and all the washers are still in place. The only other tractor that I own that is in this condition is a Wheelhorse Raider 10.
So far I have replaced the throttle and choke cables which were seized, and got a spark to the engine. I needed to repair a wire that has been nibbled and replace the points and condenser. The exhaust valve is stuck open and it was a bear to get out. I had to smile when I removed the engine cowl as the bolt at the very bottom under the starter/generator was still in place, it has been missing on all my other tractors. It will be going back in.
Iain