4412.52.31.21 - With a face ply of walnut (Juglans spp.)

This HTS category, 4412.52.31.21, specifically classifies plywood that has a face ply constructed from walnut (Juglans spp.). This designation applies to plywood where the outermost visible layer is composed of this particular hardwood species. The plywood must also meet the criteria of the preceding classification levels, indicating it is not surface-covered with opaque materials and is not intended for specific construction or structural uses that would place it in a different subclass.

While the immediate sibling category, also designated as "Other" under the same parent "Not surface covered, or surface covered with a clear or transparent material which does not obscure the grain, texture or markings of the face ply", would encompass other types of plywood not made with a walnut face ply, this specific code zeroes in on the material of the primary decorative layer. The distinguishing factor here is the explicit identification of walnut as the constituent wood for the face ply, differentiating it from plywood with other types of nonconiferous face woods.

As this is a leaf node within the HTS classification system, there are no further subcategories beneath this code. Therefore, the classification process concludes at this point, with the specific identity of the face ply wood, in this instance, walnut, being the final determinative factor for assigning goods to this precise HTS code.