On the one hand, we have one of ten 1967 275 GTB/4 NART Spiders, in the classic Rosso Corsa and appearing at RM Auctions and seen above. On the other, we have a Fly Yellow version that started life as a 1965 275 GTB Coupe, and was converted into a NART Spider. Called a "cut" car, this particular replica is one of about 100 GTB Coupes that were converted into convertibles to satiate the climbing demand for ultra-rare Spiders.
This will mark one of the first times that an original NART Spider will go toe to toe with a replica of itself at auction, and will answer a number of questions about just how important provenance is in the collector car world. Head on over to The Times blog for the full story.