Original c1903 portrait of well-dressed young man wearing a great. Excellent photographer's logo in the bottom-right corner, showing a fish followed. By "ER's" - Fischer's, located in Saint Louis, Missouri.
There's old writing on the back, but I can't read it... It's either a name or "A Fried Bird"! It really looks like A Fried Bird to me. Including the mount: 4.5" x 3.5".