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<p>[QUOTE=&quot;calcol, post: 25408633, member: 77639&quot;]I enjoy both registries.&nbsp; PCGS restricting their registry to coins they’ve certified is not a big deal for me.&nbsp; When I collect a series, I make it all PCGS or all NGC.&nbsp; The PCGS series go in their registry; the NGC in their registry.</p><p><br /></p><p>The point assignment methods are different between the two registries.&nbsp; NGC uses an algorithm based on rarity of type, date and grade, and market value.&nbsp; The points for a particular coin can change over time.&nbsp; Presumably, this could cause a set to change in ranking.</p><p><br /></p><p>PCGS assigns a weight to each coin in a series and multiplies the weight times the grade of each coin in a set then sums these products to get a score.&nbsp; There can be bonuses for things like color in copper or top of pop.&nbsp; The weights were assigned long ago and appear to never change.&nbsp; Some are now ridiculous.&nbsp; For example, an 1881-CC Morgan has twice the weight of an 1890-CC or 1891-CC.</p><p><br /></p><p>Another difference is that to receive an annual best set award at PCGS, the participant must have at least 95% set completion.&nbsp; At NGC, percent completion doesn’t matter.&nbsp; If you have the best set, you’ll get an award.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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