Heiland
In June 1958 Cook sold a painting through Sotheby's for £45 that later became known as Leonardo da Vinci's Salvator Mundi which was sold for $450 million by Christie's to Saudi Prince Badr bin Abdullah bin Mohammed Al Farhan. The family was of the belief that the artist of the piece was Giovanni Antonio Boltraffio, a contemporary and studio mate of da Vinci.