Vintage or antique union made wallpaper square. Made in the US. I have several of these wallpaper squares with the same exact stamps and designs on the back, and a lot of them have stamps indicating that they are union made in the USA, while others were not stamped. Still, it's obvious that they are all the same brand, so I'm assuming that all are union made in the US. 

It says color fast and water fast on the back. I estimate that this is from the 1940s or 1950s. Never used. No glue or paste on the back. Measures 18" long x 15" wide approx. Edges are jagged on one side but can easily be cut by the buyer to be perfectly straight. I believe this was a salesman's sample. See photos for more info. Any flaws such as small tears, etc. will be photographed and can be easily seen from the photos.