The GP7 is the most beautiful of Ducati's GP bikes, and not just because it was a winner. The front fairing has excellent proportions and the bike has good intangibles, featuring Ducati's steel trellis design and hailing from an era before aerodynamic wings, bore limits, control tires, etc.
Surprised this is only going for $500K, considering the scrutineering sticker from Catalunya, which is widely regarded as one of the era's best races.