It was listed by Puckerings. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Puckerings has dated this piece to the 1910s.
The front of the cup has a very regal Armorial Crest with a Lion engraved.

The top, again made from silver plate has a bayonet fitting (twist and lift) mechanism with the lid plugged with cork to protect the precious contents.
Excellent condition, measuring 6" tall x 3 5/8" wide, a good impressive size.
Item ID: 34132
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Puckerings has dated this piece to the 1910s.
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You can view the stock and full dealer information on the Puckerings Profile Page