I wonder how those Pal hollow ground blades shaved when they were brand new. I'm guessing it was a sales gimmick, since nobody makes them that way now. Great way to capitalize on the reputation of hollow ground straight razors, and use it to sell DE blades. The marketing guys were pretty sharp back then.(pun intended)
Just noticed, those Pal and 6 O'clock blades look like they would fit a Segal razor, no?
Who were the 6 O'clock blades made by? They MUST be better than 7 O'clock blades, because they're an hour earlier, and the early bird catches the worm.