This is a very good hand-blown, English, Georgian, wine drinking glass with a facet cut stem, dating from the 18th century, circa 1785.
These glasses are very collectable. It is made from English lead glass which is relatively heavy and has a soft grey colour.
The glass has the usual striations, inclusions and tiny bubbles you would expect to see in 18th century glass, which gives these glasses their unique charm. 
The glass has a round funnel bowl which sits on a good facet hand cut stem which extend into the base of the bowl, the stem having a central knop. The stem leads to a conical foot having a snapped off pontil mark to the underside, which has been ground smooth. There are no chips, cracks or any evidence of restoration.
Nominal dimensions:
Bowl rim diameter: 2.38 inches
Foot diameter: 2.7 inches
Height: 5.75 inches
Overall a beautiful 18th Century English drinking glass.
 
Diameter
2.7 in
Height
5.75 in