I've changed my mind about the nameplate, I'll leave it in-situe.
The 1-2-3-4 is a bit strange, as this only a two circuit double-pole unit.
The plywood separator is just an interference fit.
Would it originally have been for DC mains?
The fragments of wiring I removed from the terminals all had perished VIR? insulation with the exception of one red & black pair of pristine 1mm modern PVC
