Woodbridge Antiques has dated this piece to the 1930s.
The silver maker's mark is also visible for the silver maker: James Dixon & Sons Ltd.

A super item, fabulous as a gift for any occasion!
Condition: This flask is in great condition. (There is a slight impression on one side and a small dink on one of the shoulders - see images - these do no detract from this wonderful item and we mention them for complete accuracy.)
Hallmarks: Sheffield 1936 by James Dixon & Sons Ltd.
Measurements:
Height: 11.5 cm Width: 8.5 cm Depth: 2 cm
Weight: 110 grams
Weights and measurements are approximate.
Woodbridge Antiques has dated this piece to the 1930s.
Specialists in quality antique silver, fine jewellery & accessories
You can view the stock and full dealer information on the Woodbridge Antiques Profile Page