Question for PSA regarding Cy Young flip

This is a PSA 6 T206 Cy Young card currently in Mastro's auction:
My question is, how is the front of the flip the more modern version (with squared corners as opposed to rounded), while the back is the older version with the hologram (which has been gone for years)? I'm not trying to stir anything up here. I just want to know if this flip is legit.
My question is, how is the front of the flip the more modern version (with squared corners as opposed to rounded), while the back is the older version with the hologram (which has been gone for years)? I'm not trying to stir anything up here. I just want to know if this flip is legit.
"My father would womanize, he would drink. He would make outrageous claims like he invented the question mark. Sometimes he would accuse chestnuts of being lazy. The sort of general malaise that only the genius possess and the insane lament. Our childhood was typical. Summers in Rangoon, luge lessons. In the spring we'd make meat helmets. When we were insolent we were placed in a burlap bag and beaten with reeds - pretty standard really."
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Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's
Or Regional Canadian Baseball Issues?
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