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I was wondering if this is part of the York name and I just didn't notice. They were made in the same place and in the same time period.

Also... does anyone know how to place a serial number of one of these horns? I am referencing a baritone?

They were one and the same. Check the York section at Horn-u-copia. From my understanding, the instruments went down the same line using the same numbers, so John Swain's UCal at LA site may shed some light as to date. Except for the pre-1903 dates, I use hisprelimiary serial number list for consistent dating.