Robert Bush Antiques has dated this piece to the Victorian era.
It’s hallmarked for London 1892 with the silversmiths mark for William Gibson & John Lawrence Langman of the Goldsmiths & Silversmiths company and it also comes with a spoon which is hallmarked for London 1808 so is obviously not original to the pot.

The spoon and mustard without the liner weigh 108 grams/3.4 troy oz and it’s all in excellent condition.
This mustard pot will come in a gift box with a certificate of authenticity.
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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.
You can view the stock and full dealer information on the Robert Bush Antiques Profile Page
Robert Bush Antiques is a registered member of LAPADA