It runs!
I only plugged it in briefly - with a circuit breaker in place - but the light comes on, the motor runs and the needle goes up and down! No smell or burning
Brilliant.
Serial number is EL538722 - part of a set of 5000 numbers assigned on 13 June 1956. Next set of numbers was assigned January 1957, so I can assume she was already made by then.
Decal pattern is 'Prism'.
Mr will rewire the plugs, it's in pieces and needs replacing anyway so will be nice new black wire when it's done. I will have to clean and service the machine, and together we will take a look at the internal wiring and the motor/brushes etc.
Who needed to work in the garden, unpack the rest of the boxes, or even do any sewing? LOL