| XV |  |  |  |  | base metals and articles of base metal | 
 | 78 |  |  |  | lead and articles thereof | 
 |  | 7801 |  |  | Unwrought lead : | 
 |  |  | 780199 |  | Unwrought lead (excl. refined lead and lead containing by weight antimony as the principal other element) | 
 |  |  |  | 78019910 | Unwrought lead, containing by weight >= 0,02% of silver, for refining "bullion lead" | 
 |  |  |  | 78019990 | Unwrought lead (excl. lead containing by weight antimony as the principal other element, lead for refining containing by weight >= 0,02% of silver (bullion lead) and refined lead) | 
| XVIII |  |  |  |  | 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 | 
 |  |  |  | 91132000 | Watch straps, watch bands and watch bracelets, and parts thereof, of base metal, whether or not gold- or silver-plated, n.e.s. |