Siemens Stufenwiderstand or resistance decade box. From 0.1 R to 12.2 kR. Includes a continuous 0 R to 1.1 R (gigantic) potentiometer. Power rating is unknown, but, from the physical size of the resistors, is probably quite high. Contains resistors with 0.5 % tolerance. No date indication. The metal casing is very strong and solid and has a high-quality feel to it. The unit is still in spec.