One of just three Ferrari 275GTBs is expected to make £650-780,000 at Bonhams’ Spa Classic sale on 25 May.
Sold new in 1965, chassis number 06663’s second owner was Vempa SaS – a Lancia main dealer and authorised body shop, which was co-owned by Fabrizio Ferrari.
On its first competitive outing, the car came second at the fifth annual Agordo-Frassené hillclimb in 1966.
Shortly afterwards, the Ferrari was fitted with its long nose making it one of just three of its type, according to the former head of Scagletti Guerra Giancarlo.
At the same time, the car had three additional Weber carburettors fitted (bringing the total up to six) and was resprayed white.
Among a string of competition successes, the modified Ferrari would take second in class at the inaugural annual Bassano-Monte Grappa hillclimb in 1967 and first at the 10th annual Stallena-Boscochiesanuova hillclimb that same year.
Pushing the Ferrari for top spot is a 1968 Lamborghini Miura that carries a guide price of £380-550,000.
The early P400 was restored at the Sant'Agata factory's Centro Restauro under the supervision of legendary chief test driver – Valentino Balboni – and comes with a signed letter of confirmation from him dated 14 April 2008.
Even rarer than the Lamborghini is a 1974 Porsche 911 Carrera RS that is valued at £340-420,000.
The last of just 109 built, the Porsche features a 3.0-litre engine (up from 2.7-litres), has been partially restored and shows fewer than 57,000 miles on the clock.
Set to make £320-440,000 is a 1942 Alfa Romeo 6C 2500 that was delivered new to Berlin.
The car was discovered after WW2 in the US wearing a new body and was sent to Italy for restoration in 1998 by Alfa Romeo specialist Dambacher.
Fitted with a Diamante Touring Corsa Spider body, 915134 was completely overhauled, including the engine that was fitted with triple carburettors.
The car would compete in the Mille Miglia in 2000 and be further restored (to the tune of €34,320) in 2008.
View the auction’s full lot list on the Bonhams website.