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HankronJulie is correct. The Old Judges are photographs, and the player images were made from glass negatives not a printing plate. So, this wouldn't be an original Old Judge printing plate.
However, a printing plate like yours, with the metal coating on an 'embossed' piece of wood is an old fashioned form of printing. I have no clue what the plate was used to print (poster? newspaper? book? piece of art? I'm sure the '$10,000 Kelly' was used many times), but it is probably many decades old. This could mean it's from 1950, not 1887, but it is an interesting piece of memorabilia. If you could trace down what it was used to print, that would likely at least double its value.
This type of printing (called 'releif', as the printing suface is in relief) was most commonly used in publishing (books, magazines, newspapers), but this also includes posters and even trading cards issued by book/magazine/newspaper publishers.