This Harrison gold dollar is lacking its gold color and, almost looks silver. Any ideas on what happened? Same weight as a normal gold dollar.
Looks like your dollar coin spent some time outside or in the elements. The dollar coins will brown up in time like pennies. The dollar coins have 77% copper outer layer according to Smalldollars.com mixed with Ni, Mn, Zn. Copper doesn't fair well to keeping its shine.