An "exceptionally rare" Faberge sedan chair model is up for sale at Cotswold Auction Company in Cirencester, Gloucestershire, this Monday.

The piece bears the mark of workmaster Michael Perkhin, who supervised the production on the Faberge eggs, and is thought to have been made for the Russian royal family.

Bought for a mere £75 ($93; €84) from Wartski antique dealers in 1929, worth around $4,000 (€3,350) in today's money, the work has stayed within the same family ever since.

The sedan chair, made of gold, rock crystal, jadeite and mother of pearl, is one of only 10 in the world. While auctioneers have set a pre-sale estimate at $125,000 (€113,000), they believe it could sell for as much as $1 million. A similar piece sold for 865,000 (€780,000) at Christie's in 2017.

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