This set contains a slide rule, paper outer box and plastic container, by Graphoplex from France. This model is the 1600 student slide rule. On the box are the other products by Graphoplex like the Duplex, Radian – Log, Neperlog, Neperlog – Hyperbolic, Polyrietz, Tecnilog and Trigoflix. The number 1600 is on the side and it has pictures of ref 690a and ref 640 on front and back. The number 16o0 is on the rule which is in complete but has a small crack, so selling this as a display piece. It measures ca. 29 cm or 11 1/2 inches. Do check the attached video on how to work your vintage man tool : slide rule operation instructions!