Proportional dividers with case and instruction sheet, metal / paper / leatherette, made by Staedtler, Germany, 1950-1970
Staedtler proportional dividers are a pair of metal sliding pointers with decimal scaling joined by a knurled knob scale-slide clamp which locks the angle and the proportional scale between the pointers. Each pointer has a compass point at either end. In blue velvet (corduroy) lined leatherette case, with instruction sheet.
They are used to transfer dimensions from one scale to another in drawing charts and plans.
Staedtler brand on leatherette case, scales on each pointer.