The World is Made of Glass Ltd. has dated this Georgian Air Twist Glass to the 18th Century.
The glass is in excellent condition for its age. It shows age related wear and tear to the rim of the foot commensurate with some 250 years of use. It has a rough pontil mark on the underside of the foot.

The glass has a bell-shaped bowl measuring 7.2 cm (2.9 inches) in diameter at the rim. The bowl is plain and sits on a multi spiral air twist stem with four knops, a rare configuration. The stem ends in a conical foot which also measures 7.2 cm (2.9 inches) in diameter. The glass is 18.3 cm (7.3 inches) in height. There are no chips, cracks, significant scratches or any obvious evidence of restoration.
English lead glass weighing in at 170 g. (~ 6 oz.).
The World is Made of Glass Ltd. has dated this Georgian Air Twist Glass to the 18th Century.
Dealing in antique and collectable glass from the 17th to the 21st century.
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