2018-S Cumberland Island Proof

San Francisco struck the 2018-S Cumberland Island clad proof at 1,019,398 pieces, the figure matching the U.S. Mint Clad Proof Set sales total because the five 2018 quarters shipped as a packaged product. Donna Weaver's reverse honors Cumberland Island National Seashore on the Georgia coast. The composition centers on a wild horse running along a dune ridge, the dynamic mane-and-tail engraving drawing on the feral horses that have ranged the barrier island since the colonial era. The issue is the fourth of five 2018 releases and the 44th of the 56-design ATB program.

Proof finish on the issue is the standard San Francisco style: mirrored fields struck from polished planchets against dies frosted in chemical baths before each press run. Cameo (CAM) and Deep Cameo (DCAM) are the contrast designations PCGS, the Professional Coin Grading Service, and NGC, the Numismatic Guaranty Company, apply on top of the numeric grade, with DCAM the default outcome rather than an upgrade tier. The diagnostic strike areas concentrate on the horse's mane, at least three readable legs in the running pose, and the dune-grass texture along the ridge line; weak strikes flatten the mane striations first. Grade distribution clusters at PR69-DCAM and PR70-DCAM with top-tier population counts in the thousands. The clad composition (75% copper-nickel over a pure copper core, 5.67 grams, 24.26 mm) matches every Washington quarter struck since 1965, so counterfeit risk is essentially nil at the issue's price point.

The issue routes through year-set or design-set assembly. A raw certified PR69-DCAM example moves for a small premium over the cost of breaking up a sealed 2018 Clad Proof Set, and PR70-DCAM examples in NGC or PCGS holders sit at a modestly higher tier. The dynamic horse-and-dune composition is one of the most engraving-forward designs in the year's group, which gives the issue marginally firmer registry interest than the quieter 2018 reverses. Topical wildlife collectors and Georgia-focused buyers treat the issue as a baseline acquisition, though that interest has not separated pricing from its 2018 sister designs in the broader market. For the broader story of the ATB proof program and the series' production arc, see the Washington ATB series history.