is a very very special watch. Much of the internal components uses the brands (at the time) newest silicon called Silinvar. In this watch it’s using the GyromaxSi balance wheel. The shape of the wheel looks like an hour glass with inlaid gold added for weight. Two other parts also using this new material are the Pulsomax escapement and the Spiromax balance spring. The combination of these three components involved in the energy transfer of the watch are together called “Oscillomax.” The caliber 240 Q Si is based on the existing ultra-thin perpetual calendar caliber 240 Q automatic movement. The Si version has a power reserve of 70 hours – compared to the original’s 48 hours. “Advanced Research” printed on the dial above six o’clock. PT Platinum 950 case in 37.2mm. Limited to 300pcs.