Matt:
That is a terrific find! A very rare pennant, and oozing with historical significance. This original AAGPBL stuff is very under-rated, IMO.
I have seen a few examples of the following pennants (both reproduced and original...)
Rockford Peaches
Chicago Colleens
Springfield Sallies
As for your pennant, I believe it to be far rarer than those. The only other one I'm aware of was on display at the Baseball Hall of Fame, no less! See the link below, and the attached pic.
http://www.flickr.com/photos/islespunkfan/8221436298/
Congrats on a landmark pickup!