Denver is part of the mark on an American art pottery. William Long of Steubenville, Ohio, founded the Lonhuda Pottery Company in 1892. In 1900 he moved to Denver, Colorado, and organized the Denver China and Pottery Company. This pottery, which used the mark Denver, worked until 1905 when Long moved to New Jersey and founded the Clifton Pottery. Long also worked for Weller Pottery, Roseville Pottery, and American Encaustic Tiling Company. Pieces with the Denver mark date back to the early 20th century. Do not confuse this pottery with the Denver White Pottery, which worked from 1894 to 1955 in Denver.