Depends how much you're prepared to spend and how close you want to get to the original colour scheme. Single colour Powder coat would be cheapest but a proper reproduction would be several hundred quid from a specialist cycle paint shop.
Then there's the rest decals tyres, wheel rebuild, etc.
Have you checked if the seat post moves?
If you want a value check on
eBay .
I think you might find most buyers would prefer full Campag groupo.