Bob, I was referring to the color selection only. This ad was from the 1986 Fall & Winter, actual page #906, which is page # 916 on the scanned version, so you are totally correct.
The Toast and Platinum colors first appeared in the 1984 Fall & Winter catalog (actual page # 1052, scan page # 1045), which I would consider 1985 model year. My former neighbor Thelma had the 24" set in Toast. They had the older control panel design, with the center dial configuration. I'm quite certain they got them in Summer 1985.