Salt Dish

Hi
Can anyone help me to identify this article, and give me an idea of it’s value?
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The hallmark shows that your mustard (it’s not a salt) was assayed in Birmingham in 1961 and was made by Adie Bothers Ltd. You should be able to get a fairly good estimate of value by looking at the completed auctions listings on eBay. Note that it would be worth more if it had a matching spoon and that it should also have a glass liner.