Williamsburgh was a town that was annexed by Brooklyn New York in 1855 and became a borough of New York city in 1898. Since the medal is inscribed "Friendsfeier" it celebrates the "Peace" after the Franco-Prussian War rather than a "Victory". Not a minor distinction since many of the people celebrating the end of that war left Germany to get away from the Prussian Crown and it's militarism. I wrote an article about this and similar medals in the May 1982 issue of TAMS Journal.