American Tank: Place the instantly recognizable red box under the Christmas tree and he'll know to open this first. Inside he'll find another familiar look: Cartier's Tank watch. This model is truly American-style with its oversize octagonal case, and its silvered guilloché opaline dial, with Roman numerals and sword-shaped blued-steel hands. Housed in an 18-karat gold case is an automatic-winding mechanical movement with three chronograph counters. Water-resistant to 30 meters, the American Tank XL watch retails for $19,000 and is available at all Cartier boutiques.