Like the way you been offered one
Its only worth what somebody will pay for it.
All sellers say it ran fine when put away. We have all had that
The engine may have been knocking or another serious prob as to why it been parked up for 30 odd years. Thats the risk we have to take
If it was running for people too look at etc then yes it will be worth top money. Are the tracks ok etc etc??
If not then £1000/1200 if you ask me