I'm always looking for lots with nail knobs, spools, strains and cleats in them and came across this rare piece. It is a small 2X2 strain from Carey Ohio Prcelain Co. One of several that merged together to form Porcelain Products Inc. This picture shows it with two nail knobs and two different styles of markings on the cleats. Their marking was C.O.P. for Carey Ohio Porcelain Co. Was thrilled to find this piece.