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The most expensive Mint State 70 American Silver Eagle is the 1999. The 1999 was not the lowest mintage by any means but is worth so much because there are so few graded in perfect 70. According to NGC as of April 10, 2019, there are only 248 graded and the piece is valued at $23,000!Where is the mint mark on a silver American Eagle?
Mint Mark Location. The W mint mark will appear on the reverse side of the Silver Eagle dollar. If a coin has a W mint mark you will find it below the eagle and right above the words "1 oz. FINE SILVER".