Vintage 1912 ingraved Baseball Fob

I found this 1912 fob it is engraved on the reverse "Chicago amateur champions Marshall Field & co. Merchants League Francis Stratton Catcher" the piece is also marked Wm. Schridde Chicago xx. The 2 rings in the last photo were also found with the fob, one is the Boston Red Sox the other is the Washington Senators. Does any one have any info on these pieces. I would like to find out the age of the rings, they are not dated. also does the XX on the fob indicate the type of metal the fob is made out of. Thanks