Woodbridge Antiques has dated this piece to the 1850s.

Hallmarks for the London Assay Office and a date mark for 1834 are clearly visible on the base of the mug, along with the lion passant indicating Sterling Silver and maker's marks for Edward, Edward Junior, John & William Barnard.
Measurements:
Height to top of handle: 9 cm approx.
Width including handle: 10.3 cm approx.
Weight: 114.22 grams approx
Woodbridge Antiques has dated this piece to the 1850s.
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