Watch cases of precious metal or of metal clad with precious metal
Tariff Classification
section 18
Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; clocks and watches; musical instruments; parts and accessories thereof
chapter 91
Clocks and watches and parts thereof
91.11
Watch cases and parts thereof:
9111.10
－Cases of precious metal or of metal clad with precious metal