United States, Pan-American Expo in Buffalo, NY, 1901, Medal, UNC; United States, Pan-American Expo in Buffalo, NY, 1901 Medal, UNC, United States, 1901 Medal, UNC, HK-289, Gold plated copper. Struck as an official medal by the US mint for the 1901 Pan-American Expo in Buffalo, NY. Pan-American Expo in Buffalo, NY. Previously cataloged as brass these examples are actually gold plated copper.