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davidcycleback(Assumimg size) it's an original early 1900s cabinet card (1900-1909 range), likely of a high school player, perhaps a college or local club player.
It is a typical example of the period's high school baseball player cabinet (likely came from the family). Despite being 'common' it obviously presents well with a sharp image and pose and ornate mount. Early baseball cabinets of unknown people are collectable and have financial value. Old baseball cabinets don't have to be of a Major Leaguer to have value.