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CONECA (pronounced: CŌ´NECA) is a national numismatic organization devoted to the education of error and variety coin collectors. CONECA focuses on many error and variety specialties, including doubled dies, Repunched mintmarks, multiple errors, clips, double strikes, off-metals and off-centers—just to name a few. In addition to its website, CONECA publishes an educational journal, The Errorscope, which is printed and mailed to members bimonthly. CONECA offers a lending library, examination, listing and attribution services; it holds annual meetings at major conventions (referred to as Errorama) around the country.

CONECA was formed through a merger of CONE and NECA in early 1983. To learn more about the fascinating HISTORY OF THE ERROR HOBBY and THE HISTORY OF CONECA, we encourage you to visit us our main site Here

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Commonly Used Abbreviations

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  • Commonly Used Abbreviations

    Commonly Used Abbreviations

    Term Definition
    ADO Abraded Die Obverse
    ADR Abraded Die Reverse
    BS Business Strike
    CML CONECA Master Listing
    CC Condition Census (highest grade known)
    CCW Counter-clockwise
    CN Cupro-Nickel
    CUD Major Die Break
    CW Clockwise
    DD Doubled Die
    DDO Doubled Die Obverse
    DDR Doubled Die Reverse
    EDS Early Die State
    EMDS Early Mid Die State
    FS Fivaz-Stanton Listing
    LDS Late Die State
    LMDS Late Mid Die State
    MD Master Die
    MDD Machine Damage Doubling
    MDO Master Die Obverse
    MDR Master Die Reverse
    MDS Mid Die State
    MMS Mintmark Style
    OBV Obverse
    ODV Obverse Design Variety
    PR Proof
    RDV Reverse Design Variety
    REV Reverse
    ROT Rotated Reverse
    RPM Repunched Mintmark
    RPMP Repunched Mintmark Punch
    SD Series Doubling
    SDO Series Doubled Obverse/
    SDR Series Doubled Reverse
    SMS Special Mint Set
    URS Universal Rarity Scale
    VEDS Very Early Die State
    VLDS Very Late Die State
    WH Working Hub
    WHO Working Hub Obverse
    WHR Working Hub Reverse