1999 P Susan B Anthony Dollar Value is $1 circulated coins. If the coin is uncirculated and not certified they’re worth $1.25 to $2.
If graded MS65 by either PCGS or NGC they’re worth $5 and in MS66 they’re worth $22. 1999 Susan B Anthony, or SBA, are not silver but clad copper – nickel.
Mintmark: P (Philadelphia, PA), D (Denver Mint), S (San Francisco Mint) on the left side of the obverse, just above Anthony’s shoulder.
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