Can anyone tell me what 1868 Thompson's Old Liverpool Ware white sugar bowl is worth?

I think it is a sugar bowl, it measures 5�" X4" across the top and is footed. It is 3" tall. It has a design on the sides & is more of a creamy white. It belonged to my 99 year old mother who passed away in Jan. and I didn't know she had it I found it in her things that have been packed away for years. It looks old.