Mint marks were not used on coins dated 1965-67 as an emergency measure while the Mint struggled to replace all of the silver coins that were being withdrawn and melted.
Thus NO 1966 quarters have mint marks and it's not possible to tell where any were struck. In any case there were huge numbers issued and anything you find in change is only worth a quarter.
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The value is currently around 4 cents.
10 cents.
The silver value is about $6.00. NOTE: The US has never made a pure silver quarter, they are 90% silver & 10% copper.
25 cents. Huge numbers of quarters were churned out in the period following the switch to copper-nickel clad coins in 1965. The use of mint marks was stopped during 1965-67 so all 1966 quarters are missing that letter. The use of D for Denver was resumed in 1968, and P for Philadelphia was added in 1980.
YES I have one.