Short collectors note: “Girard Perregaux Gyromatic series is one of best Swiss automatic movement series in constant evolution. Cal. 21 is first automatic movement in GP watches with “Gyromatic” inscription and with new technology. Very rare…”
Movement details – cal. Girard Perregaux cal. 21(899), 17 jewels, incabloc shock protected, 35 h power reserve, sweep second hand, two roller freewheels.