Faber Castell 1/54 slide rule magnifier cursor 1960 Germany

This is a rare cursor with enlargement for the Faber Castell model 1/54 Darmstadt slide rule. These cursors were sold separately and hardly survive since they do not fit in the standard case. The cursor is in good condition with some darkening from the sun as can be seen in the pictures. It comes in the original marked and stamped cardboard box. I also enclosed the shown model 1/54 to make it a complete set. The slide rule measures 30 cm or 12 inches long. See the attached video on how to work your vintage man tool : slide rule operation instructions!