Phil:
The doors extending over the sides of the range is the easiest indicator of a WCI-built 40-incher.
The burners at each end of the cooktop is a slightly less reliable indicator for ranges built after 1957, because GE did make that wide-set configuration itself for a while after the Straight-Line Design styling debuted in '57. Here is a photo of a '57 GE
Mainliner (originally posted by Ben swestoyz) showing burners at each end of the cooktop, even though GE's upper-series
Liberator and
Stratoliner ranges had burners clustered at the left-hand end of the cooktop. This clustered configuration later became the standard one for GE-built GE's, true, but it wasn't always that way.
The wide-set configuration was useful to farm housewives who did canning, blanching, sterilizing and other tasks requiring large utensils - it just gave lots of "elbow room" for large pots. At that point, GE still valued its farm business.
So, you can't necessarily count on the burner configuration as a tipoff for a WCI-built range, but the doors overlapping the sides of a post-1957 40-inch range is a reliable indicator that GE didn't build the range itself.
