christostock wrote:weight is the same for 80% and 50%
if the 67 dimes and quarters are in the proof set cellophane from the mint then they are 80%
if they are not then they trade as 50%.
If you have an xray gun then you can find the true metal content.
There is also some sort of "ring test" but I would believe that to be non definitive as far as any dealer is concerned.
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