"Postage Stamp" size Horizontal Brass frame with 3 oval openings. Measures 3 1/8" X 1 9/16" high. Each oval opening, which has a beveled edge, is 11/16" X 1" . With the frame facing you, gently push with your thumbs in the oval openings, and the frame comes apart so you can insert your photos. One piece of glass is behind the triple openings. Dates circa 1910-20. I have had this frame with up to 5 openings.