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The inspiration behind the Perpetual Calendar Heritage Limited Edition came from an H. Moser pocket watch dating from the late 19th century in the H. Moser & Cie. collection. The case on this model, made from a striking blue, engraved enamel and studded with diamonds, inspired the watchmakers at the Schaffhausen-based Manufacture to reinterpret this watch. Featuring "cloisonné" enamel on a case with two covers, guilloché, engraving and setting techniques as well as "Grand Feu" enamel on the dial, in association with a modern in-house, hand-wound calibre made from solid gold. The beating heart of this exceptional timepiece is the high-performance HMC 341 calibre. Made from 18-carat solid gold, this movement is set with two diamond end-stones. It guarantees the Perpetual Calendar Heritage Limited Edition a minimum 7-day power reserve, thanks to its double barrel. Representing the culmination of nearly 200 years of history, the in-house HMC 341 calibre can be adjusted forwards or backwards at any time of day via the crown.