Ca. Ø53.5mm, ca. 116g, 18K gold, elaborately engine-turned, very rare à-goutte cabriolet pair case, where the inner case rotates inside the outer case and thus the watch can be worn as a hunting case watch or a lepine, inner case also fantastically engine turned, dome marked Chronometre, no. 79124, signed dome, excellent quality bar movement, chronometer escapement, shafts with gold chatons, perfectly preserved enamel dial, filigree Breguet steel hands, in excellent condition, in working order. Only a few chronometers in this version are known.