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. Why there are no mint marks on coins dated 1965, 1966, and 1967? Which washington quarters are worth the most? 1969 Washington Quarter 25c No Mint Mark For Sale. Source: www.cointalk.com. Source: www.ebay.com. Was thinking a mint set quarter put into circ. 8.000 $ do you have one, rare quarter 1968 value no mint mark. 1969 quarter no mint mark. Chicago Tribune. •. May 26, 1989 at 12:00 am. The U.S. Mint has inadvertently struck a new collector`s item: an unknown number of 1989 quarters with no mint mark. Such oddities are often sold.