1999 W Error $10 Gold Eagle - MS 69 PCGS Certified
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1999-W 10 DOLLARS GOLD BULLION COINS - Unfinished Dies PCGS No: 99940 Mintage: Unknown (estimated 1,000) Notes: In 1999, the Mint at West Point, New York accidentally produced what may become one of the most important rarities of the 20th Century by striking a limited quantity of Uncirculated 1/10 ounce American Eagle gold coins with the "W" mintmark below the date. Normally, the mintmark appears only on Proof versions. However, in this case, the dies never received the special polishing that gives Proof coins their deep, mirror-like qualities. No one knows exactly how many were struck, but experts estimate that only examples have been found since the mistake was first discovered in 2000. How did the Unfinished Die 1/10 ounce American Eagle gold coin come about? The answer comes from examining how the Proof versions are created. Proof coins are struck on special, high-quality presses using specially prepared blanks (planchets) and specially prepared dies. The emphasis is on quality over quantity and the goal is a coin with bright, mirror-like fields surrounding frosty design elements, thus creating what is known as a "cameo" effect. Special care is taken throughout the process to ensure that the final product (the coin) is as perfect as possible. This special care automatically limits production -- in 1999, the Mint at West
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