This is an antique C.S. Osborne & Co, compass/divider tool. One side is stamped C.S. Osborne & Co., Newark, N.J., 1 and the other side has the initials H & F stamped in it. Tool measures 5" long. It is is good condition and shows it's age. Really good metal and still tight action . I am not much of a expert on these so I'll let the photos tell the rest.