If anybody is interested, here's the history behind this:
http://agatetype.typepad.com/agate_t...sea-lions.html
Short version: there were three guys named Willie Mays in the 1940s.
(1) the "real" Willie Mays;
(2) His dad, who only played in the Birmingham industrial leagues and shouldn't appear in any DBs; and
(3) A guy named Willie (Pee Wee, Double Duty, Tat, or Chet) Mays, a pitcher/catcher/infielder from 1935 - 1949, mostly for minor teams (like the Van Dyke Colored House of David, Oakland Monarchs, California Eagles, etc.). He was the pitcher for the '46 San Francisco Sea Lions, and may also have played for the St. Louis Stars of the Negro American League in 1937.