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 01 Wristwatches, pocket-watches and other watches, including stopwatches, with case of precious metal or of metal clad with precious metal Commodity Code Description 91 01 11 - - With mechanical display only 91 01 19 - - Other 91 01 21 - - With automatic winding 91 01 29 - - Other 91 01 91 - - Electrically operated 91 01 99 - - Other