From mid-1976, here is a cool way that WJW-TV8 in Cleveland used chronakey - the rear of their news set was basically blue, so they could chronakey into anything! Here's an example of them going into their psychedelic Late Movie Intro! Notice how it bleeds right thru Jim Finerty's collar! At the news desk from R to L, we have Howard Hoffman, Jim Finerty, and...???