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barrysloateCorey posted early this morning that no National League Horner is known.
There is a team composite of the 1903 Highlanders (first year) that is different from all the others. It actually has circular photos of the players glued onto the cardboard mount, unlike the American League one that is really a photo of another photograph (that's how composites were shot).
This Highlander piece was sold in the Halper sale and is pictured in the catalog.