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'Old' is a relative term. Check the teeth on the blade to see if they have carbide tips brazed on them. If they do, the steel probably isn't worth making a blade from.
otherwise, the steel might be L6 which would heat treat similar to 1095. But then again, maybe it's not. No one can tell you for sure, mystery steel is a crap shoot.
Cut it up, heat treat a piece of it but do not temper it. Break it in a vice (wear eye protection). If it snaps like glass you're good to go. Otherwise, don't waste any more time on it....
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