2011-S Chickasaw Proof

The 2011-S Chickasaw Proof closes San Francisco's second ATB proof year, the fifth and final 2011 clad proof issue struck against the 1,268,958-set production figure that anchors every 2011 design. Donna Weaver's reverse renders the stone-arch Lincoln Bridge inside the Platt Historic District at Chickasaw National Recreation Area, a span dating to 1909 and named in honor of Abraham Lincoln's centennial that year. The site itself broke pattern with the rest of the 2011 group, much as Mt. Hood had in 2010: Chickasaw is a National Recreation Area under National Park Service jurisdiction rather than a National Park, and the design honored a smaller, less-known federal unit that had operated as Platt National Park from 1906 until its 1976 redesignation.

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 bridge's stone arch and the surrounding tree texture is heavy and dense and the field mirror is unbroken. Look at the stonework along the arch's keystone and the texture across the foreground vegetation for strike grading. Late-die-state examples show flattening across the smaller architectural detail and at the finest foliage clusters. 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 distribution, with the real climb at PR70-DCAM rather than at the Deep Cameo break. The piece does not draw the recognition demand that pulls Gettysburg or Olympic prices in the same year, so it tends to be the easiest of the 2011 proofs to find at workable money, the same dynamic that played out among Chickasaw's circulation counterparts on the P and D side. For the broader story of the ATB proof program and the series' production arc, see the Washington ATB series history.