This was interesting in that I hadn't seen it before. I wonder what it would have fetched if the seller hadn't offered it up as a BIN? I agree with the seller that it looks to be from the 1950s. Beistle's artistry was by this time a pale shadow of what it had been in their Golden Age of the 1920s and 1930s. This set's designs aren't too memorable compared to the fantastic, wildly imaginative Beistle hats shown on pages 237-241. (For instance, look at the "New Moon" hats on page 239. Wow!)
Mark B. Ledenbach's vintage Halloween collectibles blog.