Exhibit Antiques has dated this piece to the 1750s.
An English lead 18th century air twist wine glass. It has a bell bowl with a solid section at the base with small air tears. Sits on a multi spiral air twist stem with a large shoulder knop. Conical foot with snapped pontil.

Date & Origin
England, c1750.
Condition
Excellent, age-related wear as shown.
Dimensions
Height: 16.8 cm Bowl Diameter: 6.7cm Foot diameter: 7.7cm.
Historical Relevance
Hand-blown around the time of The French and Indian War from 1754 to 1763. Fought between the colonies of British America and those of New France.
Exhibit Antiques has dated this piece to the 1750s.
Specialists in 18th & 19th century antique glass
You can view the stock and full dealer information on the Exhibit Antiques Profile Page