I think I'm missing only the Cardinals (and am not sure I have ever even seen one). If anyone has this one, please post it here! I am hoping it jogs my memory (or eliminates the possibility that a Cardinals version fails to exist)
Regarding the specific year, Greg makes a good point on the Dodgers. This series could have easily carried through into multiple years (1951 - 53) which would not be uncommon. Many of those "Stadium" Pennants from the 1950s - 60s were used year after year after year...
The reason I know that 1951 was within the lifespan of this series, is that I acquired a few in a group years ago, in which the original owner wrote the dates on the backs. These were the dates that he/she attended the games, and acquired the pennants. All were dated spring/summer of 1951.
Hope this is helpful,
Mark