P

        Panama-Pacific Exhibition
        A 1915 exhibition held in San Francisco, California to celebrate the completion of the Panama Canal.
 
        Paper Money
        Term used among collectors for notes of the entire field of currency, no matter what medium on which
        they may be printed.

        Pattern
        A test striking of a coin produced to demonstrate a proposed design, size, or composition (whether
        adopted or not). Patterns often are made in metals other than the one proposed; examples of this
        include aluminum and copper patterns of the silver Trade dollar. Off-metal strikes such as this also
        are referred to as die trials of a pattern.

        PCGS
        Short for “Professional Coin Grading Service”.

        PCGS Population Report
        Quarterly publication by PCGS listing the number of coins graded and their grade. Totals are for coins
        graded by PCGS since its inception in 1986.

        Peace Dollar
        Common name for the silver dollar struck from 1921 to 1935. Designed by Anthony Francisci to    
        commemorate the peace following World War I, the first year featured another coin designated High
        Relief. In 1922, the relief was lowered resulting in the Regular Relief type that continued until 1935.

        Philadelphia Mint
        The “mother” Mint, located in Philadelphia, Pennsylvania. First established in 1792, the Philadelphia
        Mint has occupied four different locations. Currently, it is located in Independence Square, within
        sight of the Liberty Bell and Independence Hall. The Philadelphia mint engraves all U.S. coins and
        medals, manufactures coin and medal dies, manufactures coins of all denominations for general
        circulation, manufactures commemorative coins, and produces medals. This mint currently uses the
        “P” mintmark but coins produced prior to 1980 have no mintmark.

        Platinum
        Precious metal sometimes used for coinage. The only United States issues struck in platinum are the
        pattern half dollars of 1814 and the modern platinum Eagles.

        Poor
        The grade PO-1. A coin with readable date and mint mark (if present), but little more, barely
        identifiable as to type. (One-year type coins do not require a readable date to qualify for this grade.)

        Proof
        A coin usually struck from a specially prepared coin die on a specially prepared planchet. Proofs are
        usually given more than one blow from the dies and are usually struck with presses operating at
        slower speeds and higher striking pressure. Because of this extra care, Proofs usually exhibit much
        sharper detail than regular, or business, strikes. PCGS recognizes Proofs (PR) as those struck in 1817
        and later. Those coins struck prior to 1817 are recognized as Specimen strikes (SP).

        Proof Set
        A coin set containing Proof issues from particular year. A few sets contain anomalies such as the 1804
       dollar and eagle in 1834 presentation Proof sets.