It was listed by Exhibit Antiques. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Exhibit Antiques has dated this piece to the 18th Century.
Stands on a conical foot with a rough pontil.

Date & Origin
England, c1780. Period of George III.
Condition
Excellent, age-related wear as shown.
Dimensions
Height: 14.2cm Rim Diameter: 5,7cm Foot Diameter: 5.8cm.
Historical Relevance
The heavy lead glass and deep hue are indicative of its origin and period. Hand-blown around the time South Carolina became the first state to ratify the Articles of Confederation, and around the death of Captain James Cook on the 14th of February 1779.

Relevant References
English, Scottish & Irish Table Glass By G. Bernard Hughes – Page 217 Figure 171.
Glass By E. Barrington Haynes – Plate 62i and 63a.
Starting to Collect Antique Glass By John Sandon – Page 93.
An Illustrated Dictionary of Glass By Harold Newman – Page 348.
Dwarf Ale Glasses and their Victorian Successors By Stephen Parry – Page 2
Exhibit Antiques has dated this piece to the 18th Century.
Specialists in 18th & 19th century antique glass
You can view the stock and full dealer information on the Exhibit Antiques Profile Page