Light grayish green, transparent glass; cast or poured, impressed, slumped, ground and polished. Bowl. Rim plain, with rounded lip; wall descends almost vertically, then curves down and in; base narrow, slightly concave; exterior decorated with twenty-one ribs which are either vertical or slant down from right to left; they begin 1.5 cm below lip and extend almost to center of base, and are wider and more prominent at top than at bottom. Interior and upper part of exterior rotary ground and polished, with shallow concentric circles at center of floor. Many small spherical bubbles.