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hankronAs far as Pre-War paintings for baseball cards go, I beleive there are only the 1930s Diamond Stars. There is the original artwork for the M101 Sporting News Ned Hanlon, which somewhat resembles a painting .... There are a few of the original photos for some cards.
Most baseball (and football) card paintings come from Post WWII, including many for the vintage Bowman and Topps cards. Some very recent cards were based on commisioned paintings, and you can get these. Topps hired a variety of painters, each to paint one or more players, and Topps has sold many of the paintings directly to the public. If you are a modern collector, or even if not, some of these recent paintings can be sharp.