I asked a similar question last year in the link below about the '49 Leaf pennant offer, found on the back of many cards. No one was able to produce a photo of one of those definitively either. I bring this up because of the one post in this thread suggesting fleer could have "recycled" and updated the pennants offering for their own packs. I think the dimensions are off but the idea got me thinking about it.
http://www.net54baseball.com/showthr...t=leaf+pennant