Jeff Sims Antiques has dated this piece to the 18th Century.
It has the original fitted blue glass liner and a hinged lid. There is a shovel shaped spoon from the same period included and unusually, the base to the mustard pot is solid. A wonderful collector's item, both usable and collectable. Dimensions below.

Postage and packing £12.00 UK
£20.00 Europe
£26.00 Outside Europe
Condition :-Excellent with no holes or splits. There is no damage to the glass liner. The lid has a couple of dimples shown in photo and commensurate with age and use.
Hallmarks :- Clear and readable.
Date :- Newcastle 1770.
Maker :- John Langlands I.
Width :- 8 cms. (including handle).
Diameter :- 5.5 cms.
Height :- 7 cms. (highest point).
Spoon :- c1770. Maker HB.
Jeff Sims Antiques has dated this piece to the 18th Century.
Specialists in antique silver, glassware and objects of vertu
You can view the stock and full dealer information on the Jeff Sims Antiques Profile Page