If the players listed below are correct, then only 6 more players need to be identified.
left to right -
top row: Luther "Dummy" Taylor, ?, ?, ?, Frank Bowerman
middle row: ?, ?, John McGraw, Daniel McGann, ?
bottom row: Leon Kessling "Red" Ames, George Browne, Roger Bresnahan, Joseph McGinnity, Jack Warner, Samuel Mertes
1904 Giants Roster from baseball-reference.com:
http://www.baseball-reference.com/pl...amesre01.shtml
Jack Warner, Dan McGann, Billy Gilbert, Bill Dahlen, Art Devlin, Roger Bresnahan, George Browne, Sam Mertes, Frank Bowerman, Moose McCormick, Jack Dunn, Mike Donlin, Doc Marshall, John McGraw, Dan Brouthers, Joe McGinnity, Christy Mathewson, Dummy Taylor, Hooks Wiltse, Red Ames, Billy Milligan, Claud Elliott