925 SILVER - 925 means you have 925 out of a 1000 parts pure silver. Modern tarnish-resistant silver. This is the standard for silver meaning that a silver item is at least 92.5 percent silver mixed with copper to give it strength.
Yankees piece is available at Kith:
Kith NY 337 Lafayette st, 10012
Kith 233 Flatbush ave , Brooklyn , NY 11217