Crap. Actually, I take it back. It IS the Polo Grounds. And it's really early. From what I found, it seems as if the third base-side/left field stands followed that design in 1901 at least. Check out this shot of Manhattan Field from 1901, with the Polo Grounds directly next to it.
And apparently, that design had already been changed by 1904:
So, whoever won it got themselves a pretty damn early image of Matty. Possibly from his first couple of seasons. That would certainly tie in with the Bucknell sweater.
Wowzas!!!
Graig