Glass palm cup

Glass palm cup (Harden Class X,ii,b,20). Height 5.4cm, rim diam. 11.7cm. Glass pale bluish-green, with olive green streaks, many small air bubbles, pronounced blowing spirals. Rim outward folded, hollow in part and irregular i.e. much larger on one side. Pontil mark on base. Glass very well preserved, no trace of decay, and no sign of wear on the rim.