7015.90.10.00 - Round

This HTS category, 7015.90.10.00, specifically covers "Round" watch glasses. These are typically small, circular pieces of glass designed to protect the face of a watch. While the broader heading 70.15 encompasses various types of specialty glasses, including those for spectacles and hollow glass spheres, this subcategory narrows the focus to the specific application of watch face protection, with a defined shape.

The key differentiator from its sibling, 7015.90.20.00 ("Other"), lies in the shape. While 7015.90.10.00 is reserved for round watch glasses, the "Other" category would encompass watch glasses of different shapes (e.g., square, oval, rectangular) or potentially other miscellaneous watch glass components not specifically round. Therefore, the precise geometric form is the primary determinant for classification under this specific code.

As this is a leaf node, there are no further subcategories within 7015.90.10.00. Classification into this code is final based on the item being a watch glass that is distinctly round in shape.