Vintage or antique Lucky Star Sanifast single wallpaper sheet. Union Made by UWPC of NA. 

Washable and fadeproof. I estimate that this is from the 1940s or 1950s. Never used. No glue or paste on the back. This brand seems quite obscure and rare. Measures 16" long x 15" wide approx. I believe this was a salesman's sample. Edges are a bit jagged on one side but can easily be cut by the buyer to be perfectly straight. See photos for more info. Any flaws such as small tears, etc. will be photographed and can be easily seen from the photos.