The PCDA International Currency and Coin Convention. Formerly known as the National and World Paper Money Convention, effective with the 2011 edition, the event is enlarging its focus to also include dealers offering United States, foreign and ancient coins, as well as its traditional base of foreign and United States Paper Money. When the PCDA was founded, now more than a quarter century ago, its membership consisted largely of dealers whose commercial offerings were narrowly focused on the paper money collecting specialty area.