You'll need to provide more information. What kind of double-strike is involved? The same image twice on each side, but out of alignment? Opposite images on each side? Or on one side only?
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All the Washington Quarters minted in the year 1989 carried a mint mark: "P," "S," or "D." The P and D minted coins are worth in MS60 condition: 75 cents; the S coin was minted only in proof and its value is: $3.00.
Mis-stamped coins often have value over and above theri face value for collectors. However it is difficult to say for sure about the value of a misprint coin without actually looking at it. Condition of the coin is very important in such cases, if it is mint condition it may be quite valuable, however it if is worn it may not be worth all that much.
There are two possibilities: If the coin is thinner than a regular quarter, you have what's called a lamination error that occurred when the outer layers of cupronickel cladding detached from the copper core. Lamination errors among clad quarters retail for $10 to $15. If the coin is the same thickness and weight as a normal quarter, someone plated it. Unfortunately that makes it an altered coin worth only face value.
Current retail values is $10.00 issue price was $11.00
Simple answer: Your 1989 silver dollar is a one ounce bullion coin made of pure silver, the value as of today (10-10-10) is $23.22NOTE: Precious Metals Spot Pricing changes by the minuteduring marketplace trading.