PNG certificate Before third-party certification was started by PCGS in 1986, these certificates were the best available protection for the coin buyer.
PNG certificate
A document (in duplicate: one for the coin owner and one kept on-file at PNG) completed by a PNG dealer that provided a guarantee of authenticity prior to third-party grading services.
PO ...
 See also: Surfaces, Planchet, Lettering, Regular, Precious metal
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