1998-S Proof

The 1998-S proof Washington quarter was struck at San Francisco to a recorded mintage of 2,086,507 pieces and closes the standard Clad Proof run of the original Flanagan-eagle series, the last year before the 50 State Quarters Program began reshaping the denomination in 1999. The figure tracks closely with the 2,055,000 of 1997 and sits at the lower end of the 1992 to 1998 run, reflecting the continued shift of collector dollars toward the Silver Proof companion. The S mintmark sits to the right of Washington's hair queue on the obverse, in the position adopted when mintmarks returned to the obverse in 1968. The issue is struck on cupronickel: 75 percent copper and 25 percent nickel bonded to a pure-copper core at 5.67 grams. The companion 1998-S Silver Proof carries the same date and mintmark but reverts to 90 percent silver at 6.25 grams in a separate set.

Authentication centers on the brilliant proof finish first: deeply mirrored fields, crisp square-edged devices, and the squared rim that separates a proof from a circulation strike. A weight check settles any composition question against the Silver Proof, since the clad piece registers 5.67 grams against the silver piece's 6.25, and edge inspection confirms the reading because the clad coin shows the reddish copper-core stripe along the rim while the silver coin shows uniform color through the edge profile. The Mint's mature die-preparation routine continued to produce Deep Cameo, the heaviest contrast designation between mirrored fields and frosted devices, on most certified examples. Certification through PCGS, the Professional Coin Grading Service, or NGC, the Numismatic Guaranty Company, is the working standard for any premium-grade buy.

In the modern collecting landscape, the 1998-S Clad Proof functions as the series-ending entry in the original Flanagan-eagle proof run and tends to attract end-date buyers in addition to the usual year-set and registry audiences. Most surviving examples grade PR68 through PR70 in Deep Cameo, with the meaningful pricing break at PR70 Deep Cameo. The collecting audience runs to year-set builders closing out the 1968-onward proof run, registry collectors chasing PR70 Deep Cameo top-pops, and Washington specialists who treat the date as the formal close of the pre-State-Quarter era. For the broader story of John Flanagan's design and the series' proof program, see the Washington Quarter series history.