Do you have similar pics of the other side of the card? If it was a trim job, who's to say which side got sliced.
On a logic note, I'm not an expert, but when a card is trimmed using a paper cutter, X-Acto knife or whatever, there is a lot of force exerted downward on the card, so the very edge would sorta curve down a microscopic amount...if you know what I mean. A card coming out of the factory almost 50 years ago would have had plenty of time for that edge to re-elevate and match the rest of the card. So, if the edge sort of minutely curves downward, that is a reason for concern.
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