'Tis a 1958 WA-850R! And it came in a couple of versions. Yours is the most recent one with the modernized backsplash design that would last until 1963. The first version was a way to get rid of all the parts manufactured for the game-changing 1957 WA-850P.
Melvin - did that dryer out and share some photos!
Ken - one correction to your illustration; only the TOL, programmed, 'piano key' model had the intermediate trim on the front. The 800-series only had the trim at the top front.