I did some looking around, and I believe it is possible this was produced by Moss Photo Company. I've seen two examples of this exact photo. The first, posted below, is one I picked up in Leon's last auction. Note that the name is in similar font but it located in a slightly different position. It does, however, have a line identifying it at the bottom. The second photo does not belong to me, but a fellow board member shared it when I posted mine in a pickup thread. It is identical to yours in every way with the exception of the copyright script. I know mine is 8x10 and believe the second one is as well. Given the similarity, I would say there is a good chance they were produced by the same company. However, this photo is really popular and was used in other issues like the 51 Wheaties Premium Photo, so I cannot say for certain.
