An intensely private man, Klein thereon quietly assumed one of the world’s greatest car collections in a work yard on the grimy outskirts of Los Angeles.
With no public access and very few permitted even a glimpse of the astounding collection, his junkyard set built up an aura and mystery matched by few.
The crowning glory of the collection is the Mercedes 500K, arguably the rarest car ever produced by the German marque.
A one-off two-seater made for pre-war Silver Arrows legend Rudolf Caracciola to travel to and from races in style, it was presented to him in 1935 and created with an extra large windscreen to accommodate the German’s tall frame.
Via a Paris dealership, the car ended up in the hands of Italian dictator Benito Mussolini’s son-in-law during WWII, then following his execution lay being hidden for a long period in a manure pile in Ethiopia before finding its way to the US.
It was last seen publicly when brought to a car show by Klein in 1980, and has remained under wraps ever since.
A Car and Driver investigation into the car and collection 12 years ago estimated it would be worth over $10m (£7.7m) – but classic automobile prices have rocketed since then.