Hello, I have a "pot belly" stove that is pretty large and has the name Duplex Oak above the door. The number 217 is on the edge of the rim above this. I have seen a Mity Oak and a King Oak as well. The King Oak that I saw on Google Images also has the 217 above the rim. Does anyone know where these were made and by whom? Also, approx. when was it made? Any ideas would help.