Matériel du boîtier: Or rose; Mouvement: Remontage manuel; Conditions: Neuf Etat du lot: Avec boîte et garantie ; Modèle: Double Tourbillon Prix devis Gmtbroker Référence: Vision Super Exclusive & Extremely Rare RARE & EXOTIC SPECIAL EDITION Greubel Forsey Double Tourbillon 30° Vision * * You WILL NOT See Many of These Around! * * EXCLUSIVE MANUFACTURED TIMEPIECES The Double Tourbillon 30° Vision features an open dial allowing the invention to be viewed and appreciated to the full. In order to respond to the specific requirements of the tourbillon in a wristwatch, Greubel Forsey developed this groundbreaking double tourbillon, with one 60-second carriage rotating inside another carriage rotating every four minutes. In this world premier construction, the double tourbillons average out gravity-induced errors on the balance. The construction allows for superior chronometric performance; a minimum volume/maximum balance diameter ratio; and enables the superbly finished mechanism to be fully appreciated. Also known as: Greubel Forsey Vision