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Like the toy trains, rock and pop memorabilia and teddy bears under threat at CSK, American Indian art is a publicity-grabbing discipline but suffers from a shortage of supply, at least for the valuable pre-contact material. US legislation also prohibits the sale of some spectacular ceremonial objects because they contain the feathers of protected species.

Sotheby’s, who use a part-time consultant to catalogue their sales, have taken the major share of the recent auction market – last year they sold the Dundas collection for $6m (£3.35m) – with specialist sales also held by Bonhams & Butterfields in San Francisco and Skinner in Boston. Christie’s will still sell pre-Columbian art in New York, and tribal art in Paris.