What is the rarest Ferrari?

What is the rarest Ferrari? Even the Ferrari F40 is positively common with a fleet of 1,311 being built. However, this 1984 Ferrari 328 Convertible (serial number 49543) is the rarest of them all, being the only one in existence.

Even the Ferrari F40 is positively common with a fleet of 1,311 being built. However, this 1984 Ferrari 328 Convertible (serial number 49543) is the rarest of them all, being the only one in existence.