My Dad, now 91, was a Military Historian. I had a posted in the Historical Autographs group a link to some of the letters in his collection that included Political figures, Astronauts, Media figures (Chet Huntley, etc.).

This link is to only the Presidential figures, although some are from individuals who became President. Senate letters from Kennedy, Humphrey, Johnson, etc. 

http://1drv.ms/1B5Foqw

The photo from Warren G Harding was inscribed to my Great Grandmother, Anna Mullen. She and Harding shared the same birthday, which is what he is referencing in his comment. I have seen many photos of Harding apparently from this sitting, however, in most of those he is looking at the camera. This is a profile. Would this affect the value?

Appreciate your input.....!

Eileen