From Garrett Scott Books: "Detroit: n. p., 1912 & ca. 1912-1920? Postally used real photo postcard, approx. 5.5 x 3.5 inches, cancellation dated Oct. 1912, addressed in pencil to a correspondent in Addison, Mich. Black and white photo, approx. 6 x 4. The postcard additionally annotated on the verso in ink, “Rex in dress Nelson Omans on Post.”" http://www.bibliophagist.com/gscott/images/pdfs/OL4.pdf (item 3)