Tom,
The red version to which you refer was a 1961 only offering, and it did have the piano keyboard switches, and a Sensi-Temp unit. I had one of the red ones when I moved to Mobile, purchased in Pensacola. I spent a TON of time cleaning up years of grease and grime only to be rewarded by a serious short one evening that plunged the entire house into darkness. I sold that one.
Based on the fact that the one listed has an Automatic burner, it has to be pre-1961, and with the charcoal on the backsplasher and the rotary switch style, I'm guessing this is a 1959 model.
Not a bad find for $10.
lawrence