Well, the name is nothing more than a distributors name. In the 60s and even today, a few drum builders make the vast majority of drums available to the market, b ut they sell them under many names. In the early days, the big makers of import drums were Pearl and Star (later to become TAMA). Between them they made about 95% of all the 60s and 70s import "stencil" drums. These were almost iderntical, with each having characteristics that were common. For instance, Star lugs are easy to tell, if you know what you are looking at, they used 2 bass lugs and 2 tom and snare lugs, design-wise. The American distrubutors had many "brand names" they used for certain markets, often competing against themselves on the same shelf.
For instance, Stewart and Apollo, both names owned by St. Louis Music Supply, were often seen on the same shelf, or in music stores "next door" to each other, and they were vitually identical, but since the names were different, they could sell the same drums to Joe's Music Store and George's Music Depot without getting the retailers mad at the wholesaler. I could give each store in the same market, say I have 10 music stores in Oklahoma City that I, as a Regional sales rep, can go to each one and sell them the same exact drums, all with a different name, and give each one an "exclusive distribution agreement" and they are literally all identical, with the same exact parts. The "brand name" of one line is garranteed to Joe, George gets "B", Ed's gets "C"....so on down the line.
So this kit, although badged as "Beltone" is infact built by Pearl, as evidenced by the bass lugs. Both Pearl and Star used a very similar tom lug design, a copy of the Slingerland Sound King. knowing one from the other is a bit tricky, because unless you hold them sideXside, it is difficult to tell them apart. One has a more sloped back end than the other. Hope you kind of understand how it works. Same goes for GP, SP, Apollo, many names today, and some are made by Pearl, some by TAMA, some by Mapex and a few Chinese companies as well. Actually, many Chinese companies, and Koreans and Taiawanese as well. Those are really, for the most part, real junk and will not make the 40 year haul your kit has.
Now, to give you an idea, this kit was likely from the very end of the 3 ply era, mid-67. I say this because of the lug design on the bass.