I know your post is old but I have information on the studio. Alma Elliff (my Dad's Aunt) married George Warren Orr in Tulia, TX and they had 4 kids. If you want more information please contact me. I have a picture of my grandfather: Hobert Donald Elliff (Alma's brother) with the same stamp on the back and dated 1929.
My Lineage: Hobert Donald jr, Hobert Donald sr, Daniel Hodges, Ananias Oliver, Clement, John O., John