The 2011 $50 Buffalo Tribute Proof Collector's Coin is a highly sought-after fantasy issue coin featuring a unique design and composition of 24-karat pure gold and gold-clad bronze. With a fineness of 0.999, this uncirculated coin is likely to be a valuable addition to any collector's portfolio, especially with the added authentication for verification of its authenticity. A must-have for collectors interested in rare and unique coins.