Grueby Pottery & Tile Co ship trivet tile with glazed sides. A great design in their famous well curdled matte green, brown, and yellow glazes. It measures 6 inches square and 1 inch thick, 10 1/2 inches square framed. Marked only with the glazer’s initials, MD. It is in great condition with only a tiny bottom edge chip filled in and no crack or firing flaws.