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 08 Watch movements, complete and assembled. 91 08 11 91 08 11 00 Commodity Code Description 91 08 11 00 00 -- With mechanical display only or with a device to which a mechanical display can be in