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