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You could wait till the ice is gone and put it into the water to see where it floats and compare that to there similar Whalers. Take a photo and post it to photo bucket and post a link to it here. Does it have bottom paint? Any water line on the paint? Again, post a photo. One accepted way to tell is to weigh the hull and compare it to factory specs but with boats that old there is always some water which has seeped in over the years through unbedded fittings and screw holes. Post some photos and you'll get a lot of opinions.