Watermark
"In hand made paper the wire design is sewn or soldered to the mould on which the sheet is formed, causing the fibres [sic] to lie thinner where they touch it. Early watermarks were copied and many appear confusingly similar. In these instances the position of dots, occurring at each of many places where a thread of wire was used to fasten the watermark to the mesh, will assist in identifying sheets made in one mould" (Glaister 508).