Pistol Pencil

Need some help with this one. It is a mechanical pencil shaped like a pistol. The lead holder part is pulled back and locks in place inside the barrel until the trigger is pulled and then it snaps out for use. It looks like something is missing that was soldered to the cylinder beside the barrel. Possably an eraser or spare lead holder. It looks as if there was lettering stamped to the left grip but impossible to read what it was. Closest thing I could find was a "Dip Pen" that was similar in design