1964-D

The 1964-D quarter is the last 90% silver Denver business strike in the series, with the Mint producing 704,135,528 pieces, the highest single-mint Washington quarter mintage ever recorded and roughly 140 million pieces above the Philadelphia 1964 total of 564,341,347. The explosion responded to the silver shortage of 1963 to 1965, with silver prices crossing the $1.29 per ounce threshold at which a silver dollar's metal content matched its face value and the public hoarding pre-1965 coinage faster than the Mint could replace it. The composition stays at 90% silver and 10% copper, a 6.25-gram blank yielding .1808 ounces of actual silver weight. The D mintmark sits on the reverse below the wreath, which is the last appearance of reverse-mintmark Washington quarters before the 1965 to 1967 mintmark suspension and the 1968 move of the mintmark to the obverse.

Strike quality on the 1964-D runs from average to good, with the era's typical softness on the eagle's breast feathers and Washington's hair above the ear, often compounded by the rapid die wear of the high-output year. The authentication priority for this date is distinguishing the silver issue from the 1965 clad transition: weight test resolves the question cleanly, with the silver coin at 6.25 grams and the clad coin at 5.67 grams; edge appearance differs as well, with the clad showing a reddish copper-core line and the silver showing uniform color across the edge profile. The D mintmark punch deserves the usual five-to-ten-power look for any underlying letter ghost, given the 1950-D D/S precedent. Population reports at PCGS, the Professional Coin Grading Service, show the date plentiful through MS65 thanks to the enormous mintage, with a clear drop at MS66 and genuine scarcity at MS67.

The 1964-D is a common date in the modern catalog, set-fillable in circulated grades at silver-melt-driven prices and obtainable in MS65 without effort. The issue serves as the natural Denver counterpart to the 1964 Philadelphia for type-set and end-of-silver-run year-set builders, and original-roll examples still occasionally surface in dealer inventory because the huge mintage left many bags untouched into the 1980s. Realistic acquisition is a certified MS65 or MS66 from a major auction, with the genuinely scarce upgrade target sitting at MS67 where examples thin sharply enough to draw four-figure money. For the broader story of John Flanagan's design, the 1965 silver-to-clad transition, and the series' production arc, see the Washington Quarter series history.