Exhibit Antiques has dated this piece to the Georgian era.
A multi spiral air twist wine glass with a central swelling knop dating to c1750.
Almost certainly a Jacobite sympathy glass when openly supporting the Jacobites was a hanging offence.

A beutiful example.
Date & Origin
England, 1750 George II.
Condition
Excellent, age-related wear as shown. No chips, cracks or restoration.
Dimensions
Height: 15.2cm
Bowl: 4.8cm
Foot: 6.7cm.
Provenance
Arthur Henry Green, a private collector from Enfield, died 1953. Thence by descent.
Exhibit Antiques has dated this piece to the Georgian era.
Specialists in 18th & 19th century antique glass
You can view the stock and full dealer information on the Exhibit Antiques Profile Page