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 02 Wrist-watches, pocket-watches and other watches, including stop-watches, other than those of heading 91.01. 91 02 11 With mechanical display only Commodity Code Description 91 02 11 00 With mechanical display only