Leading the charge of significant racing cars on the grid for RM Auctions’ Monaco sale in May is this devastating 1948 Ferrari 166 Spider Corsa “Fontana,” one of the most interesting and important early prancing horses to be offered in recent memory.

The ninth Ferrari ever built in chassis sequence

The ninth Ferrari ever built in chassis sequence and the sixth 166 Spider Corsa to be produced, the car boasts an extraordinary and extensive period race history, first with Scuderia Ferrari and later with Scuderia Marzotto, for whom it was rebodied in 1950 in the Barchetta-style by Carrozzeria Fontana.

Click to enlarge; Tom Wood ©2012 Courtesy of RM Auctions

Documented as one of the most raced Ferraris in existence, it was recently restored to Concours-quality condition.One of the most raced Ferraris in existence

One of the most raced Ferraris in existence

The car’s competition portfolio in the 1948 to 1952 period includes two Mille Miglias and two Targa Florios, during which time it was piloted by such notable drivers as Bracco, Maglioli, Frolian Gonzales and the Marzotto brothers.

Click to enlarge; Tom Wood ©2012 Courtesy of RM Auctions

Expect to cough up around $2.5 million if you want to join their storied ranks…