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@rodabod
A few things to consider:
If it's the original wheel on an older bike, then it may well be a freewheel system as opposed to freehub.
The rear spacing between the stays may be 120mm (up to 5 speed or Ultra-6), 126mm(up to 7-speed) or 130mm (see freehub options). Steel frames can be re-set wider or narrower, though up to a 6mm squeeze isn't much and you can often get away without re-setting on a flexy frame.