Hamilton H77796135 Khaki Aviation X Wind Day Date Auto Chrono LIMITED EDITIONProduct Overview The 2018 limited edition of the "Khaki X Wind" series features aviation functions for pilots, including Hamilton's innovative "drift correction angle calculation function." It is equipped with the H 21 Si chronograph movement, which is Hamilton's first movement with a silicon hairspring, and has been certified as a chronometer by COSC, boasting high precision. Limited to 1918 pieces. Specifications Product Number H77796135 Caliber H