2010-S Grand Canyon Proof

The 2010-S Grand Canyon Proof is the fourth release of the inaugural ATB proof year, struck against the 1,397,219-set production figure that anchors every 2010 San Francisco clad proof. Phebe Hemphill's reverse renders Granite Gorge from the canyon's North Rim with the Colorado River cutting the foreground and a layered sweep of side canyons receding into the distance. The composition is the most landscape-dense design in the 2010 group, which gave proof dies an unusual amount of relief work to render at low height: the polished-field mirror reflects open sky across the upper register while the frosted devices carry the canyon strata in heavy contrast. Grand Canyon was first protected by President Theodore Roosevelt's 1908 executive proclamation, with full national park status following in 1919.

Authentication on the issue starts with the S mintmark above Washington's head and the surface contrast that defines a modern proof. PCGS, the Professional Coin Grading Service, and NGC apply two cameo designations that drive most of the market value: Cameo (CAM), strong mirror-to-frost contrast, and Deep Cameo (DCAM), where the frost on the canyon strata and the river contour is heavy and dense and the field mirror is unbroken. Look at the strata lines along the upper canyon walls and the foreground river contour for strike grading. Late-die-state examples show flattening across the finer side-canyon detail where the relief is shallowest. 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 on the modern alloy is functionally zero.

As a collecting target, this is a Regular-classification issue widely available in PR69-DCAM across both major services and steadily supplied in PR70-DCAM at a workable premium. Pop reports for the date show standard 2010 distribution, with the real climb at PR70-DCAM rather than at the Deep Cameo break. Grand Canyon's recognition value gives the design a popularity edge among single-design buyers, similar to Yosemite, which makes the proof one of the more frequently transacted entries in the 2010 group. For the broader story of the ATB proof program and the series' production arc, see the Washington ATB series history.