This box reeks of Australian history, custom built for Sydney University Physics Lab use in a nice solid diecast box with that oh so common baked enamel finish.The central element, the large meter is a classic Master Instruments (made here in Sydney once upon a time)Not sure but I think the meter casing is bakelite material, not plasticCurrent SourceSwitched between two ranges300mA1 AmpVoltage limiting indicatorOutput on banana socketsPolarity reversal toggle switch11 position rotary switch giving 0.1 current stepsRange switchNeon Power On indicatorClassic old style toggle switch (French made)COSMETIC CONDITION:Good condition, no broken controlsMeter face is clean although lightly marked INSIDE the glass – I have made no attempt to lift the front off to give it a clean.Light aluminium corrosion to the front panelVery cleanTESTING:It works fine, checked out both ranges and the equipment performs as designed.