Section 18 Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; clocks and watches; musical instruments; parts and accessories thereof 91 Clocks and watches and parts thereof 91 10 Complete watch or clock movements, unassembled or partly assembled (movement sets); incomplete watch or clock movements, assembled; rough watch or clock movements Commodity Code Description 91 10 11 - - Complete movements, unassembled or partly assembled (movement sets) 91 10 12 - - Incomplete movements, assembled 91 10 19 - - Rough movements 91 10 90 - Other