High Standard, mostly, but also several others. Here's a good cross reference link, which includes all sorts of guns, not just pump shotguns. I know mine, a plain Jane mid sixties version in 20 gauge, and my father's late 40s/early 50s really plain Jane 12 gauge where both High Standard. Some years, about 8, after I got it, I saw a High Standard just like it, in the early '70s. That was at what today would be a standard "stop and rob". Not then. It was Holiday gas station and convince store. They had some junk food, some decent food, car chains, hammers, shovels, bait, fishing supplies, ammunition and guns. Don't recall if they any handguns, but they did have both .22 and center fire rifles, along with the shotguns Not more than one of each model/caliber in the rack. They did have, I think, handgun ammunition.
Sadly today, while still around they are just another stop and rob, sometimes with bait and fishing tackle, depending on location.
Around 50, yes fifty, years after my Mom bought my Dad that 12 gauge, I saw one, branded High Standard, but made by Armscor in the Philippines, that was pretty much it's twin, right down to the jeweled bolt and the general "feel" of the action. Although some of the cosmetics weren't quite as nice. Just like Dad's but not mine, if you would hold the gun vertically, barrel up, with your hand off the fore grip, and trip the slide release, the action would open about half way. They were really smooth.
The '40s JC Higgins is still soldiering on, at least it was a couple of years ago. My brother had it refinished, and the cracked stock repaired, for his son,the youngest grandchild of the original owner, to use in high school level trap competitions. He's got a new Remington now, it's a might lighter than the JC Higgins, but the Higgens/High Standard still get's 'er done.
Thanks for your insights. It’s what makes America what she is: the one and only.