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Thanks, I had no idea. I'm pretty sure it's French now, unlikely to be Raleigh as English bikes weren't really heavily imported down here to Portugal but French bikes definitely were. Luckily I think the steerer is too long for any kind of frame my size anyway so I can probably get away with cutting the threaded part but good to know!
Zebra
There were a few standards floating about. French is the only one I've encountered (outside of the essentially interchangeable Italian).
Sheldon, as ever : https://sheldonbrown.com/cribsheet-headsets.html
Velo Orange sell a French threaded headset if it is that.