2008-D Oklahoma, Satin Finish Proof

The 2008-D Oklahoma Satin Finish Proof is Denver's contribution to that year's Annual Uncirculated Coin Set, paired one-for-one with the Philadelphia issue inside every subscription package distributed in early 2008. Oklahoma's quarter led off the year on January 28 as the 46th state's entry, and the satin format was now in its fourth and final year of Statehood-program production. Phebe Hemphill's reverse shows the scissor-tailed flycatcher in flight over Indian blanket wildflowers, with the motto "Labor Omnia Vincit" arched above and the 1907 statehood year anchoring the base. The flycatcher's long forked tail-streamers spread wide across the upper field, a composition whose rhythm depends on negative space, a choice the satin treatment serves well by leaving fields and devices under a uniform matte sheen.

Authentication begins at surface texture. Genuine satin specimens present an even matte finish across both fields and devices, the product of acid-etched or sandblasted dies rather than the polished-and-frosted dies used at San Francisco. There is no rotating cartwheel luster of the sort that travels across a roll-pulled Denver business strike when tilted, and no mirror-and-cameo contrast of the type that marks an S clad proof. Composition is standard cupronickel-clad, 91.67% copper / 8.33% nickel by total weight, with a 75/25 outer cladding over a pure copper core, at 5.67 grams and 24.3 millimeters. The D mintmark sits above Washington's queue on the obverse; no S satin variants exist. Third-party graders use SP or SMS designations rather than PR.

Per-mint mintage finished at 745,464 pieces for the 2008 set, the lowest yearly figure of the 2005-2008 satin Statehood run and the only year of the format to fall below the 800,000 mark per mint. Because the coin never entered circulation, the as-struck Denver surface generally survives intact on examples recovered from sealed Mint Sets, and most certified pieces fall in the SP67 to SP69 band with SP70 examples appearing often enough to hold top-pop premiums modest. For Hemphill's broader statehood work and the rest of the 2008 release year, see the 50 State Quarters series history.