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 12 CLOCK CASES AND CASES OF A SIMILAR TYPE FOR OTHER GOODS OF THIS CHAPTER, 91 12 90 PARTS OF CLOCK CASES & CASES OF A SIMILAR TYPE FOR OTHER GOODS OF CH.91 Commodity Code Description 91 12 90 00 PARTS OF CLOCK CASES & CASES OF A SIMILAR TYPE FOR OTHER GOODS OF CH.91