This teapot lid (finial is missing) is a type of ceramic ware called Jackfield. It was manufactured in England from about 1745 to 1790. Examples of this distinctive ware are common on American historical archeological sites dating to the 1760s (Noel-Hume 1969:123). See an image of a whole teapot at: http://www.darwincountry.org/explore/005031.html
Foodways, Service
2004-666-114
Lot 35 Tavern Cellar