Graig: I had a look at a couple of Arcadia books about the Giants and the Polo Grounds. Couldn't find anything specific to 1915 but the attached scan might be useful.
This shot is from 1916. The Fatima sign seems to have changed from year to year. It doesn't match up with the Ruth photo. The Ever-Ready sign looks like it may be the same. The Uneeda Biscuit sign in the background is probably the same.