This is an antique “Mary Gregory style”glass decanter.

The term 'Mary Gregory' indicates a style of glass rather than a manufacturer. It originates from the myth that a lady in USA named Mary Gregory painted scenes of children on thousands of items of glassware. It is now known that this style of glass originated from Bohemia, not America. Mary Gregory did actually live in America, and worked for the Boston and Sandwich Glass company during the 1880's, but she painted landscapes, not children. Regardless of the truth that is now known, the name has stuck, and this style of glassware is still defined as Mary Gregory glass. Several factories in Bohemia produced Mary Gregory glass during the Victorian era and later. Some European countries still make glass in the Mary Gregory style to this day.

As you will note the stopper isn’t original; the date of manufacture is possibly around 1870 because as from research there is a similar one online with its original bubble stopper and this is etched 1871.

Absolutely charming decanter, small rough area on rim of spout - have tried to show in last photo but it’s quite hard to pick up.