The first thing I did was pull out some old Sales Manuals. I do have some pictures of a stove similar to this one in a 1941 sales manual (the 1940 sales manual I have does not have anything similar). The stove in my 1941 manual has the same back splash as Dionne's....(which was called the "Deluxe Cove-Top" with "edge-lighted dials"). It looks like this was a newer back splash that they were introducing.
The stove in this manual was different from Dionne's in that the vents on the back splash do not run horizontally. It's a little hard to tell from the pics, but I think the vents in the sales manual are either vertical..or the stove vents from the back. The knobs on the manual stove are an older style...Dionne's are the same as the later Deluxe. The burners on the sales manual stove are also one unit on each side.
I'm guessing this stove is a 1942 or 1943 model. Your guess?