Republican Party (United States) | Democratic Party (United States) | Australian Labor Party | Democratic Party | Liberal Party of Canada | Liberal Party of Australia | Republican Party | Liberal Party (UK) | Social Democratic Party of Germany | Liberal Party | Nazi Party | New Democratic Party | Progressive Conservative Party of Canada | Democratic-Republican Party | Green Party | Democratic-Republican Party (United States) | Social Democratic Party | Progressive Conservative Party of Ontario | Conservative Party of Canada | Ontario Liberal Party | Communist Party | Communist Party of China | political party | Socialist Party | Republican Party (U.S.) | Labor Party | Federalist Party | Federalist Party (United States) | National Party | French Communist Party |
In the May 26, 2003 edition of Coin World, the hobby newspaper had announced they had contracted investigators to conduct a year-long, comparative study of PCGS, ACCGS, NGC (Numismatic Guaranty Corporation) and several other grading services, each known as a Third Party Grader (TPG).