A rare BMW 507 that was first owned by Greece’s last monarch, King Constantine II, will be offered  for sale at Bonhams’ Monaco auction on May 11. The 1959-vintage car could sell for up to 2.5 million euros, according to estimates.

The 507 roadster was produced in a run of 252 cars, although the original intention was to build 5,000.

King Constantine sold the 507 in 1961, and after falling into considerable disrepair over time it has been with its current owner since 1989.

A three-year restoration by 507 specialist Brummer was undertaken at a cost of 300,000 Deutschmarks, since when 50,000 kilometres were added to the clock as the car was entered into a number of competing, including four times in Italy’s Mille Miglia. The original licence plates for the car, a simple ’36,’ are also included in the sale.