2018-P

Philadelphia struck 502,150 of the introductory American Innovation Dollar in 2018, the smaller of the two circulation issues for the Washington Patent design and the lower-mintage half of the inaugural pair. The coin launches a series authorized by Public Law 115-197, signed July 20, 2018, and the 2018 design is the only one struck before the program shifted to four state releases per year in 2019. That single-issue introductory year gives the Philadelphia strike a fixed slot in any year-set or series-set build.

The reverse shows a quill pen and signature above "First Patent Granted, July 31, 1790," a nod to the patent awarded to Samuel Hopkins for an improved process for making potash. Designer Castro Bock and sculptor Renata Gordon worked the lettering tight against the central device, and Philadelphia strikes typically show full separation between the quill barbs and the upper inscription. Edge lettering on this issue carries the year, mintmark, and E PLURIBUS UNUM in incused characters; the orientation of that lettering varies coin to coin and is not considered a variety. The Mint sold the issue exclusively through numismatic channels rather than releasing it to commercial circulation, so most surviving pieces are clean and unworn.

For collecting purposes, the 2018-P sits in the regular tier despite a sub-million mintage. Modern dollar coins of similar size routinely survive in vast Mint State quantities because they never reach the public bag-and-roll attrition that older issues went through. PCGS and NGC, the Professional Coin Grading Service and Numismatic Guaranty Company, have graded examples through MS68, and population at MS67 is high enough that raw rolls remain the practical purchase for a beginner working the series. Registry buyers chase MS68 examples, where the supply is thinner. Broader context on the program's structure is in the American Innovation Dollar series history.