What you have there is tin enamelware, and to be more specific, that particular type is called Blue Speckleware. Tin enamelware became popular in the late 1800s/Turn of the Century until the 1930's. I've never seen a stove door made from enamelware; most items were chamber pots, pans, coffee pots, cups, platers, bread boxes, etc. What are the dimensions? Breezie