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.

Siemens Decade Box

Siemens Decade Box

Siemens Decade Box

Siemens Decade Box

Huge connectors to carry high current with low voltage drop.

Siemens Decade Box

Siemens Decade Box

Siemens Decade Box

Siemens Decade Box

Siemens Decade Box0.5 R resistors.

Siemens Decade Box

Low-resistance thick solid wires.

Siemens Decade BoxBig resistors. 0.5 % tolerance.