Antique fob from 1910 commemorates the 500th anniversary of Battle of selling Grunwald by Whitehead & Hoag, Poland, Lithuania, Ruthenia 1410-1910

Pretty rare piece of history that research shows was a small fob made by Whitehead & Hoag of Newark NJ as a commemoration of the 500th anniversary of the Battle of Grunwald in 1410 which is depicted on the obverse. The front features a tri foil shield with the coat of arms of Poland, Lithuania and Ruthenia and area that is now made up of parts of Ukraine and Belarus. The bottom part reads "D.17 Lipca (July)W Boston, Mass" below the shield is a ribbon reading "Boze Zbaw Polske" God Save Poland. Measures 1 1/4" without the bail.