I have come across a couple different variations of pennants from the Beavers 1957 Rose Bowl vs. Iowa, including these two below. The top one is the first I have seen from this game that actually has the 1957 date on it. The other pennants with no date you basically had to date by finding old pictures, as I did with this earlier 1957 Rose Bowl pennant that I posted about.
Beaver Relics 