Ross Barnes of the Chicago White Stockings, later the Cubs, hit the first home run in the National League on May 2, 1876.
I believe the mount gives pitchers more leverage and also improves pitching to batters. Throwing off flat ground requires more effort if you are going to maintain the velocity of a pitcher.
== == Figure out what era the players are from, the team (name on uniform) Do a search online for pictures of players on that team, era, and compare them. The easiest thing to do is post the picture on a vintage baseball related forum and ask for help. See related Links for one forum you can use.
The Yankees were 95-67.
The Cincinnati Red Stockings