Early porcupine quill bodied mechanical pencils are not uncommon. There are three or four in my stash. This one is circa 1880's. Likely made in England. The working end of the pencil is driven in and out of the body via a button controlled channel. Length is a mere 2 1/2 inches closed and 3 3/8 inches extended. The piece is not maker marked. It speaks Sampson Mordan Company to me.