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It purports to include a piece of Napoleon’s mahogany coffin, studded with the imperial N monogram and borne by an imperial eagle with outspread wings. The gold eagle is sporting the Légion d’Honneur, inaugurated by Napoleon, and is perched on an agate globe. The crown is embellished with coloured gems; tiny brilliants adorn the crown, eagle wings, globe and cross.

This is an unusually luxurious example of the genre, prompting the suggestion that it was made for a leading figure of the First Empire or a member of the imperial family from the First or Second Empire.

Bidding reached Fr112,000 (£10,900) at Rieunier-Bailly-Pommery, France on February 28.