Definitely put the card on top of various other 1966 cards you have on hand and see if there's any wiggle room. I usually put them atop each other and stand them up on a flat table to see if they match. If you try that with a few different cards and they're identical, it shouldn't be a problem. It won't tell you absolutely, conclusively that nothing is amiss, but it gets you pretty close. And if they don't match up? That'll give you an answer too.
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