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What is NGC's Exact PL/DMPL Determination Process?

Started by Tempvs Fvgit,

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Tempvs Fvgit

Tempvs Fvgit

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As I understand it, proof-like assignments are determined by holding the coin perpendicular to a flat surface (with text or a ruler on it), and measuring the furthest distance that text can be read off of the coin's mirrored surface. Specifically, 2"-4" is proof-like (PL), over 4" is deep mirror proof-like (DMPL), and just barely shy of 2" is a star grade (semi-PL).

Is this the same process that NGC graders undergo to determine a coin's proof-like qualities? If not, what is the exact process?

Do graders only take the time to do a PL test for coins that are obviously mirrored, and does this mean that coins that meet the lower threshold of PL (i.e. 2") should be accompanied by a note to check for PL on the submission form? 

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Matt G

Matt G

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Thank you for your question. Unfortunately, the exact details may vary by coin type but the baseline evaluation method is listed below.

 

PL - fully reflective obverse and reverse

DPL - fully reflective obverse and reverse with minimal metal flow or striations 

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