Antoinettes Heirlooms has dated this Antique Masons Hydra Jug to the Georgian era.
Early Georgian period of history
It has the primary imprinted backstamp for Masons patent ironstone.
The circular impressed circle patent ironstone backstamp was used betwen 1813-1820

Masons manufactured in Hanley , Northstaffordshire England
The jug is painted in the pattern known as “Japan”
This is an outstanding example and would make and item to the listed. Set of four hydra jugs of slightly later date but the same pattern.
Antoinettes Heirlooms has dated this Antique Masons Hydra Jug to the Georgian era.
Heirlooms , past, present and future
You can view the stock and full dealer information on the Antoinettes Heirlooms Profile Page