(CNN) — One of the last Fabergé eggs in private hands sold Tuesday for £22.9 million ($30.2 million), with fees, breaking its own record as the most expensive work by the Russian jeweler ever to appear at auction.

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Commissioned by Tsar Nicholas II as a gift for his mother in 1913, the Winter Egg went to an unidentified buyer following a 3-minute bidding battle at Christie’s auction house in London. The record sum exceeded Christie’s pre-sale estimate of £20 million ($26 million).

The astronomical price tag reflects the growing rarity of the House of Fabergé’s Imperial Eggs, none of which has been seen at auction in over 23 years. The historic St. Petersburg jewelry house only ever made 50 of them, and the Winter Egg is one of just seven left in private hands. The others

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