Vintage 1948 commercial window envelope advertising Ketchum Builders Supply Co. in Salt Lake City, Utah. Features red printed corner card graphics with company logo and tagline "Everything for the Builder". Stamped with a red Pitney-Bowes 3-cent meter slogan cancel dated December 28, 1948 from Salt Lake City. Rear flap printed with additional line advertising building, plumbing, and painting supplies. Clean overall condition with mild handling creases and pencil notation at lower front corner.