I sure would like to know, too. When my parents bought the house I now own, we used an electric range with round oven window for 6-8 weeks. The house we moved out of only had space for a 30" model, and the people moving in had a 40" range. So until the cabinets and countertop could be modified, they traded ranges with us. As soon as the work was done, everyone got their own range back. I've been meaning to ask their daughter (who lives down the street)if she remembers anything about it or has any pics. I agree with Tim, the window does seem a little different than W-H. I would say this was made between '48 & '52.