Rob.... very smart to jump on them when the opportunity arises. You can always re-make the money, but cannot recreate these vintage beauties. As Jason said, these Football Pennants are super-rare, and most are tougher than Baseball by far.
So you've gotta strike while the iron is hot, because the dry spells can drag on for weeks (if not months). But of course you already know this
As for that Jackie Pennant, I was pretty fortunate to spot it shortly after it was listed. It had a starting bid that was $500 below the Buy It Now price. I didn't want to take the chance of bidding in the traditional manner, so decided to exercise the Buy It Now. A no-brainer... they just don't turn up any more, especially in that condition.