Here is an Antique Solid Brass and Bronze Scribe. I do not know if it is some project at home, or factory made. It works fine if it was homemade. It is square. I etched a few lines in some pine boards, and measured to make sure. One half looks solid brass, while the "female" half appears to be more Bronze. Take a look at the Pictures, and feel free to ask questions. Feel free to ask for more pictures.