A historic Porsche 550a race car is heading to auction

Ted Welford

A Porsche 550A Spyder race car from the '50s is one of numerous ultra-rare cars heading to an auction is Arizona later this month.

The rare machine is expected to fetch $4.5m – $5.5m (approx. £3.3m - £4.1m) when it heads under the hammer, with its incredible motorsport history being key to its worth.