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 13 Watch straps, watch bands and watch bracelets, and parts thereof 91 13 10 - Of precious metal or of metal clad with precious metal Commodity Code Description 91 13 10 00 - Of precious metal or of metal clad with precious metal