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fkwThey are in the ACC (American Card Catalog) listed as "UW". But I dont think there are any baseball related ones.
This is what is in the ACC.
Weighing Machine Cards
UW-1 Astology Cards
UW-2 Chicago World's Fair Cards
UW-3 Fortune Cards
UW-4 Movie Stars (several series blue, green, sepia, and colors. In Canada by Rhodes Mfg. Co.
UW-5 Washington DC Views