VAT rate of 5% is payable on hammer price plus buyer's premium
Anon. sale, Sotheby's, Parke Bernet, 23 February 1968, lot 158, when acquired by the present owner.
F.A. van Braam & A.B. ter Haar Romeny (eds); World Collectors Annuary, vol. xx, 1968, p. 421, no. 4676.