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As there's a neon indicator, one of the terminals must be neutral. (Unless it's designed to light only when the dimmer is off, in which case i the neon will be wired across Live-In and Dimmer-Out.) I hadn't thought that the clicking on-off section might by SPDT, but then where's the dimmed...

I have an unused vintage dimmer made in England by Superswitch Electrics Ltd, Camberley, Surrey. The device is called a Superswitch Type 8220, 40-200W, 240VAC. It is fitted with an internal neon indicator. The dial turns anticlockwise until the point where it clicks (presumably OFF) and there is...