This York American baritone is not equivalent to a British style baritone. It also is unlikely to be attractive as a daily player. Even in a regular wind band.
I sold a 1912 York tenor horn to highpitch a few years ago. The Bb American tenor horn (which pretty much disappeared by WW1) is pretty equivalent to a British baritone. Since my 1912 horn was a low pitch, it actually could have been used in a British brass band in a pinch.
If you want a British style baritone, Mack and Wessex sell 3 valve compensating instruments for a pretty reasonable price.
Adams E3 0.60 Sterling bell - Prototype top sprung valves
Concord Band
Winchendon Winds
Townsend Military Band