Julie Cartwright Antiques has dated this piece to the Victorian era.
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.
All parts separately hallmarked.
Hallmarks:
CJF for Cyril James Frost
London Assay mark.

Lion Passant.
Date letter "b" for 1897.
Condition:
very good.
Small dent on top oif lid.
Minor dings on body, commensurate with age.
Good lid.
Dimensions and Weight:
Height: 12cm / 5 inches.
Width: 10.5cm / 4 inches.

Depth: 3 cm / 0.6 inches.
Weight: 6oz / 175g.
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 Victorian era.
You can view the stock and full dealer information on the Julie Cartwright Antiques Profile Page