Greensands
That motor looks vaguely familiar. Maybe 45 or so years ago I had one of similar size and wire colours with just GEC and a type number on the side and on indication of connections.
Fortunately I contacted GEC before letting the magic smoke out.
Turned out to be a 2 or 3 speed motor (can’t recall which) for industrial fan drive applications made as a special for an air conditioning system maker. Hence no type number. I gather special in such cases referred to mounting and shaft length configurations. Slightly whacky switching arrangement too if I recall right.
If it is a fan motor it’s not much use for anything else. Effectively they are a sort of two phase motor. They are designed for maximum efficiency at the rated speed but the torque characteristics are pants at driving a variable load. High current flow off load and when loaded enough to drag the slip outside the design range.
I put a lovely looking single speed fan motor on a drill in the days before I knew about such things. Cooked it in about 3 months. It would get stupidly hot spinning off load. Would get almost too hot to touch in the time needed to shift a job on the table over to the next hole.
Yes I knew I should have stopped the drill to reposition but what 19 year old is gonna do that. Rush headedness rules at that age. Probably hormonal.
Wouldn’t surprise me if my cooked motor was rated for a very limited number of starts before the excess heat generated in run up caused the windings to deteriorate. If it were basically designed to run 24/7 a couple of hundred starts would be overkill.
Clive