Julie Cartwright Antiques has dated this piece to the 1910s.
The hallmarked hinged domed lid with bayonet locking mechanism.

Excellent gauge of silver, it feels satisfyingly heavy.
Flat narrow pedestal base allowing the flask to stand upright.
Hallmarks:
JD&S for James Dixon & Sons.
Sheffield Assay mark.
Lion Passant.
Date letter "y" for 1916.

Condition:
Excellent
No dings or dents.
Good lid.
Dimensions and Weight:
Height: 13cm / 5 inches.
Width: 8cm / 2 inches.
Depth: 3 cm / 1 inch
Weight: 4oz / 113g.
Postage UK: £8 Special delivery next day.
Postage overseas: £15 International Signed For.

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Julie Cartwright Antiques has dated this piece to the 1910s.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page