The fact that so many of these guys started in 1915, even Ruth because his 1914 season was brief, is quite a coincidence, if it is a coincidence. There was also some changing of teams going on with some of the guys, including Baker to NYA. Baker's jersey is the only Jersey that includes the "A" designation, with the others only noting the city abbreviation. Johnson and Cobb, well established in pro baseball, were correctly labeled with their respective teams.
Having had major back surgery on the 20th (from 20 years of baseball) and no work for at least another month, I have three word documents going so far and will post the other two shortly, but let me know what you think about this in the meantime. BTW, the letters on the left portion of the chest are team names by city. Walter Johnson has the "W" and Cobb has the "D." Therefore, the letters on Bodie and Cadore were likely confused as someone said, unless they were all printed at different times maybe (?). I know far, far less than you guys do, but I think these were from pre-1920, but more on that soon.
Here are the teams:
Boston Red Sox
• Babe Ruth 1914-1919 (RC) limited play in 1914
• Carl Mays 1915-1919 (RC)
• Schang 1918-1920
Washington Senators
• Walter Johnson 1907-1927 (“W” on chest)
• Joe Judge 1915-1932 (RC)
• Clyde Milan 1907-1922
• Sam Rice 1915-1933 (RC)(Pitcher 1915-1916)
Detroit Tigers
• Ty Cobb (Has a “D” on his chest)
New York Yankees
• Frank Baker 1916-1922 (NYA on chest) why not just NY, because of recent change?
• Babe Ruth 1920-1934
• Ping Bodie 1918-1921 (“B” on chest)
• Schang 1921-1925
Cleveland Indians
• Jim Bagby 1916-1922 (only 17 IP with Reds in 1912)
New York Giants
• David Bancroft 1920-1923
• Larry Doyle 1915-1916 and 1918-1920
Brooklyn Robbins
• Leon Cadore 1915-1922 (RC) (“C” on chest)
Boston Braves
• Konetchy 1916-1918 (new team starting 1916)
Philadelphia Phillies
• David Bancroft 1915-1920 (RC)
Philadelphia A’s
• Ping Bodie 1917
• Schang 1913-1917
Chicago Cubs
• Larry Doyle 1916-1917 (Some kind of change in 1916)
Chicago White Sox
• Ray Schalk 1912-1928
Cincinnati Reds
• Heine Groh 1914-1921
St Louis Cardinals
• R. Hornsby 1915-1926 (RC)