I think that's about as much of a diamond cut as you could get from the factory. I have one somewhere that's pretty close.
The Holtzman and Allen are factory for sure, I got the Holtzman in a pack when it was new. The 75 is cut from a sheet, I bought it as a miscut but later found out it was from a sheet that was badly damaged and at the time unsaleable. About half the sheet was stained and badly crumpled, but the rest made a couple 9 card panels with more popular players and a few of these really way overdone "miscuts". Back then it was really cheap, maybe a quarter instead of a nickel. And when the guy eventually told me he gave me some free stuff to make up for it. It was sort of a game, he'd occasionally show me stuff he knew was bad to see if I'd spot the problems. The 75 "miscut" was the only one I got wrong.
Steve B