I going stictly from memory here, so bear with me...
Herters sold two actions, the J9 and the U9. If I remember right, both were mauser style actions. Again, memory fails, but one was either long and the other short, or one was for magnum calibers and the other standard calibers. Sorry I can't clearly remember which was which. I was getting ready to buy one in .458 Win in 1976, but got shipped overseas before I had all the money saved.
Herters didn't make the actions, they were made, I believe, in Europe. Maybe by FN, but I can't say for sure.
Herters always advertised all the stuff they sold as the "best" of this or that, and some of it was pretty good. Some of it was not so good. Never heard anything particularly bad about their rifles. Nor anything especially good either. They sold complete rifle, barreled action and bare actions, and they were made at least well enough that nobody said they were junk. Finish quality may not have been top of the line, but then, neither was the price.
I still have a set of Herters reloading dies that I use to load 6.5x55mm Swede, and they work fine, all these years later.
I just realized, you may not know who Herter's was. They were a mail order company, based out of WI, I think. They had a few (3?) retail outlets around the country. In 1976, one of them was in Olympia WA. If it was anything to do with hunting, fishing or camping, they sold it. Most of their stuff was their own proprietary brand name (made for them) and some of their stuff was actually their own design. They even had a single action revolver of their own design and caliber (.401 Herters Powermag). Before 1968 their catalogue was 3-4 inches thick It rivaled Sears or Montgomery Wards, and it was all outdoor sports stuff. By 1976, it was only about an inch thick. By the 1980s, they were gone. The loss of mail order gun and ammo sales in 1968 dealt them a blow from which they never recovered.