This looks like a WCI Kelvinator-built range. Note that the surface units have the black porcelain center piece, not the GE medallion. Things deteriorated to the point where WCI was the only manufacturer of 40" electric ranges, but I think it is newer than 1977 because there is a tire dealer in Wheaton that also sold GE appliances and he used to have the TOL GE 40" range in his window and in 1977, I think, it was still a GE-built model, but I might be wrong. I never saw a GE with screws around the window either.