Clock or watch glasses and similar glasses, glasses for noncorrective or corrective spectacles, curved, bent, hollowed or the like, not optically worked; hollow glass spheres and their segments, for the manufacture of such glasses
Glasses for corrective spectacles, curved, bent, hollowed or the like, but not optically worked (excl. flat glass for such purposes)
Clock or watch glasses and similar glasses, glasses for noncorrective spectacles, curved, bent, hollowed or the like, but not optically worked, hollow glass spheres and their segments, for the manufacture of such glasses incl. glasses for corrective spectacles (excl. flat glass for such purposes and glasses for corrective spectacles)