First of all, the Anniversary wasn't introduced until 1946. Second, yes there's a good chance it has Vermont slate, but only if Brunswick had some left in stock after WWII, because they shut their mining down during WWII. But the Brunstone works just as well.We're these made w real slate or Brunstone
No mention of shutting down their mining operations either, but they were still shut down for the war effort.Per Brunswick's archives, the Anniversary was produced from 1945-1964. I see no mention of Brustone.
Table - 1946 | Brunswick Billiards
brunswick.pastperfectonline.com