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Ah, might not all be bad. Check what headset was in there as JIS and ISO are different - one is 30.0mm and the other 30.2mm [I think]. It's not the end of the world if it's shimmed, the head tube on my Russian bike is 30.4 and I have a Stronglight headset with a 0.1mm shim all the way round. Once it's pressed in it's fine.
More fun and games. Headset is out but the cups had been shimmed to make them fit. Head tube wall is extremely thin.