Some of these 40%er wants to be like 90%ers. Makes me wonder if the mint, made some 65-69 with some left over 90% blanks. Anyways, there is only two 90%er in the picture below, can you see which ones are it? let's see who has the eyes of an eagle.
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You could verify if they are 90% vs 40% by checking the weight, I think.
Weight of 90% half dollar is 12.50 grams +/- 0.259g; weight of 40% half dollar is 11.50 grams +/- 0.400g.