Delivered new to Auto Becker GmbH in Germany in 1983, the vanishingly rare Ferrari 512 BBi Koenig Coupé offered here has been tuned and extensively modified by the eponymous company founded by former racing driver Willy Koenig, winner of the 1962 German Mountain Championship at the wheel of a 250 GT SWB.

Today, Koenig’s company still specialises in supplying parts and accessories for Ferraris, but it is no longer in the business of carrying out performance conversions.

Consequently, what were rare cars from the outset are now growing inexorably rarer and more sought-after with every passing year.

In order to help define what we mean by ‘rare’, the vendor learned from Walter Koenig, Willy Koenig's son, that a total of between 20 and 30 Koenig versions were built across all three Boxer iterations – the carburettor 512, the fuel injected 512 and the 365.

The vendor tells us that when he bought it, the car was one of 5 in the UK, and the only one in Rosso Corsa red.

So, yes, it’s prop...