Exhibit Antiques has dated this piece to the 1750s.
A rare form of an 18th-century dram glass.
Not very often you will come across such an unusual example.

Date & Origin
England, c1790. Period of George III.
Condition
Excellent, age-related wear as shown. No chips cracks or restoration
Dimensions
Height: 8.5cm Bowl Diameter: 4cm Foot diameter: 5.7cm.
Historical Relevance

As of the start of 1760, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.
Comments
Part of an extensive private dram collection which Exhibit will be presenting over the next week.
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