[Phil G4SPZ]

Update: I made up a pair of ring terminals to fit the spring-loaded brush holders, wired it up adding an earth connection to the frame, and slowly applied mains power via my variac. At about 40 volts it slowly started to rotate - it works! The centrifugal starting switch cuts out at an estimated 700 RPM and the motor runs up to full speed at anything from 100 volts upwards.

I still haven’t found any references to this design of motor. There can’t be many still around.