Here I'm selling a rare bone and Brass Victorian ruler it has four sections but only three moving hinged parts it's approx 5mm square and strangely it has the same numbers to each side but in opersite directions and goes to 18" Long it's made with Brass hinges which it does have some cracks going through the bone and a tiny piece missing from the one but it's still together being held in with the pins any questions please ask I will answer the best I can also I can't find a makers mark but their is something but not sure if it's the bone study last picture to see if you can work it out