This egg very much resembles the "Chanticleer Egg", that was made for the Kelch Family. The egg is covered in pink colored enamel, and decorated with laurel swags of gold. It stands on a three-sided pedestal enameled in the same color, with gold trophy ornaments framed with white enamel on each side. The clock's dial is also enameled white.
Every hour an enameled, diamond-set cockerel pops up from inside the egg, flaps his wings four times and then nods his head three times while opening and closing his beak and crowing. This performance goes on for around fifteen seconds before the clock strikes the hour.
This egg was an engagement gift from Béatrice Ephrussi de Rothschild to Germaine Halphen, when Germaine got engaged to Beatrice's younger brother Baron Edouard de Rothschild. Until 2007 the "Rothschild Clock Egg" remained in the Rothschild family, but on November 28 that year it was sold by Christie's in London to Russian art collector and businessman Alexander Ivanov, for 8,980,500 pounds (including commission). Eventually it was displayed at Ivanov's Fabergé Museum in Baden-Baden, Germany.