Hi everyone! I recently picked up this mechanical pencil that I believe to be from the civil war era. It is a slide pencil, has a screwable jewel top, and the name "Ezra C. Dean" engraved on it. The mechanical mechanism slides in and out, the jewel top comes off, and the hook loop on it also slides. I'm looking for more information on this such as who made it, when was it made, what is it exactly, what is its worth, that sort of thing. Any and all help is much appreciated. Thank you!