If we use 1941 as the cut-off, a few more not yet mentioned (except Boudreau and Reese) - mostly photos though:
Lou Boudreau (1938):
Joe Gordon (1938):
Ralph Kiner (ML Team Photo) (1941):
Pee Wee Reese: (1939 and 1940):
How 'bout this Warren Spahn photo from 1940 w/ Bradford Bees:
Early Wynn (1939):
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http://imageevent.com/derekgranger
HOF "Earliest" Collection (Ideal - Indiv): 244/342 (71.4%)
1914 T330-2 Piedmont Art Stamps......: 114/119 (95.8%)
1923 V100 Willard's Chocolate............: 177/180 (98.3%)