CDV image. Top is Cole Younger. Bottom left is Jim Younger. Bottom right is Bob Younger. All three images are often published and well known, in life images. I bought this one because I had never seen THIS exact grouping before in a CDV. I have several other Younger images in finer condition but because it is slightly different, it caught my eye and I wanted it. That is the essence of a collector. There is no photographer's mark at all.