The Porsche 911 is one of the most distinguished high-performance sports cars in history. This 1973 Porsche 911 Carrera RS 2.7 Prototype (Chassis no. 0012) in a nostalgic Signal Yellow is the second one built out of only four. Later this month, RM Sotheby's will be auctioning off one very special RS 2.7, a pre-production prototype, of which nine were produced. This specific model was the second of nine prototypes and wears a beautiful Signal Gold exterior and is missing the signature ducktail spoiler of the production model. It also features slightly wider rear wheel fenders, an 85L gas tank, and chrome trim around the turn signals, a detail that was eventually changed to black. It’s expected to sell for around $1,500,000.[ link ]