In the United States, a significant number of private mints produce bullion which is not legal tender and is targeted at investors and not at coin collectors - such as this one.
The Tombstone Hammered 1 oz Gold Round is produced by the Scottsdale Mint.
The Mint says about it:
"Own a piece of the Old American West with a hammered gold piece crafted in the historic nostalgia of the infamous town of Tombstone, Arizona, “The Town Too Tough to Die.” These 1 troy ounce solid gold rounds are crafted to be unique and each one varies just a touch. Slightly different shapes, textures, and personality. Included is a Certificate of Authenticity from the Scottsdale Mint and a mining-inspired money bag."