1996 Russia 3 Roubles Icebreaker Yermak 1 Oz Silver Proof BOX & COA. 250th Anniversary of the Foundation of Russian America. Metal fineness: 900/1000 Silver. Fine metal content: 31.10 g. Diameter: 39.00 mm. Thickness: 3.30 mm. Mintage: 25,000 pcs. Edge: Reeded, 300 corrugations. Saint Petersburg, Russian Federation (1724-date).