WASHINGTON. D.C. -- A one-of-a-kind Treasury gold proof coin has been surprisingly discovered within the vaults of the Smithsonian Institution. This 1854-S gold Double Eagle $20 coin was struck by the San Francisco Mint in its first year of operation. The San Francisco Mint was born out of the need for a Western Frontier Mint when, in January of 1848, gold flakes were discovered at Sutter's Mill triggering one of the most important chapters in U.S. History--The California Gold Rush! To the surprise of historians, this single "S" mint Proof coin was individually struck from specially polished minting dies. How this unique Proof Double Eagle made its way across the continent and then into the hands of the Smithsonian Institution is still a mystery.oday the First Federal Mint announces the public release of the first ever Proof commemorative layered in 24k gold honoring this rarest U.S. Government $20 gold piece. This Proof has a frosted image against a deep mirror field, creating a breathtaking work of art in gold. This 150th anniversary Mint release honors the legacy of a true historic masterpiece.

The magnificent proof is layered in 24k gold and measures a full 39mm in diameter to truly showcase the beauty and intricacy of this legendary coin design. The Double Eagle Proof is available only through this limited edition, private release from the First Federal Mint at the advance issue price of $19.95 each.