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 ROUGH WATCH OR CLOCK MOVEMENTS. 91 10 90 OTHER COMPLETE CLOCK MOVEMENTS, UNASSEMBLED/PARTLY ASSEMBLED, INCOMPLETE.. Commodity Code Description 91 10 90 00 OTHER COMPLETE CLOCK MOVEMENTS, UNASSEMBLED/PARTLY ASSEMBLED, INCOMPLETE..