This is the answer I found online. Usually it would say on the glasses, but if these are vintage probably more difficult to do.
line up two lenses and look through them. Rotate one. If it doesn't get darker & lighter, then at least one lens isn't a polarized lens.
If you don't have two pairs of lenses then rotating one pair of polarized glasses whilst looking through them at an LCD screen will work fine, eg your computer screen or even your digital watch face. Rotate the lens clockwise through 90-180 degrees and the screen/watchface will go dark and then light up again as you keep rotating.
line up two lenses and look through them. Rotate one. If it doesn't get darker & lighter, then at least one lens isn't a polarized lens.
I have never tried the latter, as I am only aware of lining two lenses and rotating them at 90 degrees
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