CT-100 advertising is next to nonexistent. It was on the market for a very short time before the successor came along. As far as I know, RCA did not run big glossy ads in national magazines, etc., as they did for later models. The ETF website shows a few newspaper ads from local dealers, but that's about it.
I agree that "new" in this sign likely means "this year's model." When I was a kid working in a grocery store, I think the Oxydol label always had the word "new," year in and year out
Phil Nelson