~~ Vintage / Antique Postcard of the Polo Grounds, NY ~~
John McGraw Insert

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Very early postcard from what I believe to be the Williams Company of the Polo Grounds in NY which was home to the NY Giants.  Produced somewhere between 1910 to the 1930's.
There is a small crease in the bottom left which is hard to see via pictures and it appears someone has erased pencil marks on the back as if it were going to be used and then they stopped.  Also fairly difficult to see in the scans.  But what you can see is their writing "SERIES NY  NY  NO. 5"  Not 100% sure what that meant.
The Giants played the Yankees in the World Series in 1921, 1922 and 1923 and again in 1936.  They also played in 1951 but I wouldn't count that one.  So it likely dates to that timeframe and either way, it's a really cool piece of history.