Chances are excellent that they were built by either Pearl or Star. These two companies were responsible for the hundreds of "stencil" kits we know and love! If you had a little money behind you, you could custom order kits with variations on hardware, badges, etc. While most kits were fundamentally the same, each brand was cosmetically different. There were literally dozens of brands to choose from back in the 60's at local music stores and were what many of us had to choose when we, or our parents, couldn't afford the kit of our dreams; Gretsch, Ludwig, Rogers or Slingerland!