Probably from the 20s or before. I kind of collect old doors apparently. These I use to make items out of as I have shown in the pictures. There are 2 of these. They measure 39 X 9. One has a slight buckle/warp. Both have layers of old chippy paint. you can either incorporate it or sand it off. Buckle/warp is in picture 4 I believe and not that noticeable but it is there. Deducted a few dollars off this one because of the buckle. I have other door inserts up for sale as I will never finish all of them. I would be more than happy to combine shipping. Shipping is high because of the size. thank you 8