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The centrifugal starting switch operates correctly
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Ah, so it has a split-phase winding on the rotor? That implies there is no special starting means that would warrant the inverted configuration, but it might be a measure to circumvent a patent on the (later generic) stationary starting switch arrangement that toggles out of mechanical contact with moving parts when running. If you can see any of the starting switch, please can we have a pic?
I think the end-bell castings show it to be genuine Metropolitan Vickers Trafford Park construction rather than BT-H who had the much larger market share of FHP inductions. It might be early enough to be pre-AEI.