Variable step attenuator mounted in very nice wooden box.
L90286
3000 ohms 50mA max. Stepped switch selection. 6" by 4", by 4 1/2" high. Bulgin knob is 58mm long. Please check the extra photos to appreciate the quality of the apparatus.
www.pbase.com/brixton_morris/electrical_meters
Check out my other items ! Some nice work benches there from the Lab.