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davidcyclebackI'm assuming they're paintings. If so, the type of paint used would be relevant. If they are oil, that would be consistant with 1800s or early 1900s. If they are acrylic (synthetic version of acrylic), they would be from the second half of the 20th century. Oil paintings often have a subtle luminous, glowing quality. Acrylic colors are much brighter and plastic-like, sometimes like a bright plastic toy ... Of course there are other types of paints, but oil and acrylic and standards
To me, they don't look like recent representations of the way baseball players would have looked like-- in particular the hats.