Hello, New to the forum. I am trying to sell this old Rapid Oak coal burning stove (I think) for my mother. I have no idea of the value. Looks to be in descent shape. On the inside of the main door, there is a letter "P" and a number "17" stamped on it. Don't know what this means exactly. I read it indicates something to do with a model # or year of the stove.... 1917? There is also a "plate looking thing" that has a picture on it I found inside the stove. I was wondering what this is used for o
r what it is? I would be very appreciative of any information any of you might have regarding this. Here are some pics of it.