Fabergé eggs and other objets d’art, with an estimated worth in excess of $90 million, are being offered through Sotheby’s by the heirs of publisher Malcolm Forbes, who collected the fabled works from 1960 until his death in 1990. The auction will be April 20 and 21 in New York, with the presale exhibition opening April 12.

More than 180 objects from the House of Fabergé are in the Forbes Collection, which David Redden, vice chairman of Sotheby’s calls a “virtual Aladdin’s cave of treasures.” The collection includes the first of the royal eggs from the workshop of Peter Carl Fabergé, which was an Easter gift commissioned in 1885 by Czar Alexander III for his wife, Czarina Maria Feodorovna. The annual Easter tradition of giving a Fabergé egg continued with Czar Nicholas II, who in 1895 gave his wife, Czarina Alexandra, the Rosebud Egg, also in the auction. Among the other seven eggs being offered are the Coronation Egg, which took workmaster George Stein 15 months, working 16 hours a day, to complete, and the Order of St. George Egg, given to the czar in 1916 to commemorate his leadership during World War I.