Looks to be 1910s to 1920s era... I'm guessing the team played somewhere in Massachusetts, or maybe a neighboring state. In those days, teams usually ordered uniforms from a nearby supplier, in this case Boston.

I'm guessing Minor League or college because of the nice quality of the uniform. Unfortunately these simple styles are very tough to match, especially with the lack of photos taken back then. It's definitely a quality uniform and I love me some Kruk Cards!