Third-party grading (TPG), aka coin certification services, emerged in the 1980s with the goals of standardizing grading, exposing alterations, and eliminating counterfeits. For tiered fees, certification services grade, authenticate, attribute, and encapsulate coins in clear plastic holders.
Thir,d-party grading (TPG) aka coin certification services, emerged in the 1980s with the goals of standardizing grading, exposing alterations, and eliminating counterfeits. For tiered fees, certification services grade au,thenticate, attribute, and encapsulate coins in clear plastic holders.