This watch has a quickset 24 hour GMT hand that makes it ideal for travel, keeping track of two time zones. This 1993 Bell & Ross by Sinn (dual name) highly sought after, the watch is known as Space 2 Ref144 with a see-through sapphire case back displaying the caliber 7750 Valjoux automatic winding movement. Titanium case 40mm and matching bracelet, Screw-down winding crown.