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 03 Clocks with watch movements, excluding clocks of heading 9104 91 03 10 - Electrically operated Commodity Code Description 91 03 10 00 - Electrically operated