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 11 Watch cases and parts thereof 91 11 20 CASES OF BASE METAL, WHETHER OR NOT GOLD-OR SILVER-PLATED Commodity Code Description 91 11 20 00 CASES OF BASE METAL, WHETHER OR NOT GOLD-OR SILVER-PLATED
