Check the listing for details. 1966 Quarter NMM DDO DDR. Condition: Ungraded, Made in United States. Listed at 5.00 USD. The 1966 Quarter NMM DDO DDR is a United States circulated copper coin with a denomination of 25 cents. It features an error and is ungraded, uncertified, and from the Philadelphia mint. This Washington Quarter holds historical significance as it was a transition year in the design of US coins, making it a valuable collector's item for numismatists interested in errors and unique characteristics.