This same seller has two from the set up for auction. There was a set of four 3-D cards produced before 1920. Two are shown at the top of page 286. (The complete set is now part of the collection.) Postcards with this same artwork were made contemporaneously with these stand-up 3-D cards. The eight individual postcards were combined to make the four 3-D cards. These postcards were published by Bergman as series 6070 and 6071. Each of the 3-D card designs is exceedingly rare. The cat is missing its tail in the example up for auction.
Blog
Mark B. Ledenbach's vintage Halloween collectibles blog.