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Addendum
Lacking a variac or a resistive load, what you could safely do is this - apply mains power to half of the hv secondary. The whole xfmr will then be in step-down mode. The voltages coming out of the other windings will be a given percentage of their normal values, probably around 20 - 30% or so. Allowing for the step-down factor, it'd be easy to identify which winding is which.
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