It is an electrical porcelain nail knob fragment. It has an extremely light marking of 'NT'. It was possibly made by Brunt Porcelain Co, in E. Liverpool, OH. This would place this item from 1891 to 1925. Greenwood and Associates excavated it in 2004 and assigned number 19-002927-020. It came from trench 2. Artifact is broken, soiled, scratched, and therefore in poor condition.
