Figure 51 Mug base fragment, William Rogers, Yorktown, Virginia, 1720–1745. Lead-glazed earthenware. Diam. (approx.) 4". (Courtesy, National Park Service, Colonial National Historical Park, Yorktown Collection.) COLO Y 10,919. Some of the earthenware mugs were covered in a white slip before glazing; none yet identified bears the impressed “wr” stamp.