Each measures 6" x 6".
Backsides do not contain any information about the manufacturer. Several of the tiles were stamped on the backside by the man who salvaged them in the 1980's. I found an index card in this box of tiles placed there by the man who salvaged them containing the address of the house these tiles were salvaged from. According to him they were split up between mantles in a double. Each surround contained 8 tiles. They are numbered 1-8 on the backside. One tile has crazing to the face, see images. One tile has a chipped corner and two others have chips to the glaze along the edge, see images.