I nominate these three in the
http://www.sportingoregon.com/ collection:
(1) 1915 Chicago American Giants postcard, April 1, 1915, in Portland. Left to right, Bill Gatewood; Hurley McNair; Dick Whitworth;
Pete Hill;
Bruce Petway; Harry Bauchman; Walter Ball; Fred Hutchinson; Pete Duncan;
Louis Santop (behind Duncan);
Rube Foster; Horace Jenkins; Frank Wickware; Bill Francis; Jesse Barber.
(2)
Willie Wells postcard, 1943.
(3)
Jimmy Claxton Zeenut.
For more, including early African American baseball, visit
http://www.sportingoregon.com/