That looks like Bach to me, not Back. Josh Bach? Johann Sebastian Bach? Some other Bach? Not sure.
That "Bach" item is not a token but likely something that goes with a brass instrument manufactured by Vincent Bach Brass Instrument Company as that appears to be their logo. See this: https://www.google.com/url?sa=t&sou...FjAXegQIBBAB&usg=AOvVaw1Vux3IFumP8Kr3L9aRckl4