Thanks for all the feedback and concern (to look out for me) on the Mantle guys. Decided to do some measuring and analysis of this card and a 51 Bowman Mays I have side by side this afternoon.
I am pretty convinced the Mantle is NOT trimmed.
First of all, the cards both measure exactly under heavy magnification 3 1/4 inch wide. I will admit top to bottom the mantle seems to have slightly more air space in the case than the Mays, but under a lot of measuring (I must have done it 10 times magnified) the Mantle is
maybe a 64th of an inch shorter than the Mays, and I am not even sure by that much, it's about dead on the line. They both are right at 2 1/16 tall.
Furthermore the corner wear on all 4 corners of the Mantle appear to be very natural as are the edges. With naked eye and magnification I can't see any signs of tampering and I think myself and/or PSA would have noticed something on those corners if it were off.
Regardless, and I have shared a picture of the card in hand, it's a real beauty!
I am a collector, not an investor, and I put in my bid thinking no way I'd win it at a price I was comfortable with and I got it --
It's a card I have wanted to own since I was a kid, and while I can appreciate and am not naive to the fact there are a lot of assholes out there, not going to let it ruin my enjoyment of the card. It's a shame that as with a lot of things in life that all it takes is a few idiots out there to try and ruin the fun for the rest of us. So I get it.
appreciate the feedback
images
https://imgur.com/Ikkbvve
https://imgur.com/nh1213v
https://imgur.com/GE1kCUC
https://imgur.com/WrwFWEr
https://imgur.com/1PCune7
https://imgur.com/0geVWyT