Section 18 OPTICAL, PHOTOGRAPHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION , MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; M USICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 91 Clocks and watches and parts thereof 91 02 Wrist-watches, pocket-watches and other watches, including stop-watches, other t 91 02 91 91 02 91 00 Commodity Code Description 91 02 91 00 00 -- Electrically operated