Aramis Antiques has dated this piece to the 1900s.
The hallmarks for Chester 1902 and makers’ mark appear on one side of the flask, and the lion hallmark for silver and date mark for 1902 are also stamped on the opposite side. The lid is connected with a strong hinge, and the knob of the lid twists to open or close the flask as necessary. A really lovely Chester piece, in beautiful condition.
Aramis Antiques has dated this piece to the 1900s.
You can view the stock and full dealer information on the Aramis Antiques Profile Page