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 08 Watch movements, complete and assembled 91 08 20 With automatic winding 91 08 20 00 With automatic winding Commodity Code Description 91 08 20 00 000 With automatic winding