It is a Tappan, Tappan was the only company that divided their cook-tops into four separate sections of proceran type glass, the thinking was is something happened to one section it could be replaced separately.
Corning's first ST cook-tops had the panels in two sections that could be replaced separately.
Belanger and Gurney (at that point, not being part of Tappan as it was earlier) did similar divided tops here too.
BTW, these aren't made by Corning but by PPG. PPG also made Frigidaire smooth tops but they were always single piece. PPG called these "Hercuvit" (see the link below).
Hi Phil, Thanks for the information about the Canadian built Electric ranges that also used a four piece ceramic CT.
I still have the complete top of the Corning you pictured at our WH, I also have a better condition complete identical range that has your name on it. I hope you and Paul can get down here and get it before the convention in August.