2015-P Mohawk Iron Workers, NIFC

Philadelphia's 2015 Sacagawea carries the Mohawk Iron Workers reverse, the seventh annual Native American design and the fourth release struck under the Not Intended For Circulation rule that took hold in 2012. Ronald D. Sanders designed the scene and Phebe Hemphill sculpted it: a Mohawk ironworker fastening a horizontal beam atop a high-rise frame, a second worker silhouetted further down the steel, and the cityscape opening below. MOHAWK IRON WORKERS spans the lower field. The design honors the Kahnawake and Akwesasne Mohawk crews whose ironworking tradition began with the 1886 St. Lawrence River bridge contract and grew into the high-steel labor force that built much of New York's twentieth-century skyline, including the Empire State Building, the Rockefeller Center towers, and the original World Trade Center.

The 2,800,000-piece Philadelphia run matches Denver one-for-one and was distributed only through Mint bags, two-roll sets, and Mint Sets. None left for cash registers. Strike on the reverse is sharp on early die runs, with the rivet detail on the structural steel and the cross-bracing in the background tower the diagnostic features for a Mint State 67 or 68 grade. Mid-life dies soften the worker's torso and helmet rim first, then the fine cross-hatching on the steel itself. The obverse cheek and forehead carry the usual NIFC bag-handling story: Sacagawea's portrait fields are wide and unprotected, and even sealed-roll examples typically show one or two contact marks that hold MS68 supply thin.

The 2015-P is a Regular classification piece, well represented across Mint State 65 to 67 from original Mint product. Professional Coin Grading Service and Numismatic Guaranty Company population reports show robust MS66 and MS67 supply, with MS68 the realistic high-grade ceiling. Premium pricing kicks in only at the MS68 mark and above, or for examples carrying strong Cameo contrast on the reverse devices. For collectors building a date set, original Mint two-roll sets remain the most efficient acquisition path; certified examples at MS66 trade for negligible premium over raw. For the Native American $1 Coin Act of 2007 and the 2012 NIFC transition, see the Sacagawea Dollar series history.