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@Jonny69
It could be a 1 1/4” headset which was a mtb size for a short period in the 90s. They usually have a 28.6mm quill and the steerer is 31.8mm OD, though.
What you can do to work around brinelling, is take the cups out and turn them round a bit in opposite directions so that the brinelling doesn’t line up any more. It won’t be as smooth as a new headset but it also won’t keep notching into position.