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FOR auctioneers, ‘sleepers’ are a mixed blessing. As George Archdale, specialist at Cheffins in Cambridge, says: “It can cause embarrassment, but I would much rather a broken pot make its money with us than at someone else’s sale.”

Archdale was recalling the sale of a damaged blue and white jar with a Yongzheng mark for an unexpected £36,000 in March.

The under-valuing of Chinese objects is not uncommon as debates over date are frequent. However, in this case Archdale now believes the jar, which came from a Chinese owner, was of the period.

ATG’s selection of highest-price-over-estimate objects on thesaleroom.com in 2016