It's not seen as often, at least not where I am, since a newer version was developed a long time ago.
I'll take it! Mason is actually a brand name and this is a Wheaton jar but they both produced wire bail, canning jars like this.
I'm doing a dance right now. Lol. I've never hear of it being called a Wheaton jar before. Brilliant yet again.
Wheaton is just a different brand that happens to make them, I never hear anyone calling them that either. Kind of like calling tissues Kleenex, even though not all tissues are made by Kleenex, not all canning jars are made by Mason.