Approx. Ø52mm, ca. 117g, 18K gold, Savonnette à-goutte, guillocheed, Girard Perregaux housing punch, No. 28150, dust cover, e.g. "CHRONOMETRO", also signed, high-fine mop chronometer movement with chronograph balance, diamond cover stone, very rare spherical spiral and golden gait wheels, precursor of the 3-bridge tourbillon, signed enamel dial, original hands, functional and in an extremely rare, almost new condition. Before the construction of the legendary 3-bridge tourbillon, these ultra-fine chronometers were the finest chronographs produced by Girard Perregaux, intended for the South American market (https://www.cortrie.de/go/o8b).