What is the red 4 pointing to on the type 1? I don't see that referenced anywhere.
The allvintagecards link that Irv just posted is very accurate.
The stitching on the baseball on the back goes right to left on Type 1s (which is your card), and left to right on type 2s, so that looks ok. In the video, his information about fake backs is wrong, so that guy is probably referring his own advice where he says "disregard comments on fake backs".
Based on everything I can see from your card (using all the expert info referenced), it looks like a real type 1 card. Which I cannot fathom, since as mentioned, the initial screwdown low grade appearance just screams typical fake. But it does appear to check all the right boxes, unless there's something I'm missing
This is just my very neophyte opinion on spotting fakes, especially when it comes to the '52 Mantle. Caveat emptor.
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