With less than 1000 S1’s built, and lord knows how many have survived, and yours being a '63 model, if it is complete with no parts missing, I’d guess the bidding should start around 20,000 (US) dollars…
As a finshed road car in newly restored orginal specification condition it would be worth something over A$35,000. So in present state I would expect around A$20,000 to A$25,000 given at least $10,000 to paint and complete the rest of the car with the buyer providing most of the labour.
The car should be able to be completed as a historic racer in group M sports given its racing history or in Group Sb Production sports or as a road car which gives the buyer a few options and may help boost the price.
I think Rohan would be on the money with that estimate.
There was another S1 (very early) missing the cylinder head (and other engine bits) and no racing history but otherwise all there in Qld a few months back that sold to a business acuaintance of mine for $10K.
I would have thought $20 - $25k would be right, probably advertise at $25K and you will get something more than $20K
sorry… guessing you were thinking more?
You never know maybe more a case you have to find the right person for the car and you will get what you want for it.