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@hugo7
Measure the headset and the width of the bottom bracket (BB) with some calipers.
If you don't have calipers you should buy some. They are a useful worthwhile investment.
If it's got an odd sizing headset it shouldn't be much of an issue as I think you can still find the headsets cheap (assuming you can't service it). The BB is more of a pain as it I think buying replacements are more expensive, or you'll need the BB faced down a bit by a shop.
If it's got loose cup and cone bearings then I'd probably keep the BB and just replace the ball bearings and service.