I was the seller of the cup and I believe it was either from the 1860s or 1870s because of the uniforms and the umpire. According to the Hall of Fame page on uniforms, shield front jerseys weren't worn much after the mid-1870s.
http://exhibits.baseballhalloffame.o...es/jerseys.htm
Also, the umpire is holding an umbrella and walking stick. If you are a trade card collector, you know the image on this cup easily pre-dates images of 1880s umpires.