A 2013-W $50 American gold buffalo reverse proof gold bullion Collectable coin, $50, product of the US Mint's facility at West point and carries the 'W' mint mark. Struck from.9999 fine, 24ct. Gold bullion-the purest of any United States gold coin. Complete with the shown original leather and wood box directly from the U.S. Mint, depth 3.2 cm, width 28.34g