Robert Bush Antiques has dated this piece to the Victorian era.

The flask and cup are both hallmarked for London 1900 with the silversmiths mark for Drew & Sons (Samuel Summers Drew & Ernest Drew) - it's also marked underneath 'Drew, 156, Leadenhall St, EC'.
It holds 160ml/6 fl.oz, it's watertight, perfectly usable and it weighs 193.4 grams/6.2 troy oz
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Robert Bush Antiques has dated this piece to the Victorian era.
Antique georgian, victorian & edwardian silverware & collectables, antique boxes and caddies and decorative items.
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