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<p>[QUOTE=&quot;Cherd, post: 1472595, member: 24754&quot;]I became interested in building a Mexican centavo type collection a few years ago. At the time, I purchased David Harper&#039;s &quot;2010 North American Coins &amp; Prices&quot;. I went through the book and made a spreadsheet with prices per condition for all the coins that I was interested in acquiring. Since that point I have decided to only buy NGC graded coins for the collection, and noticed that even when graded these coins go for muuuch less than what is listed in the book. These NGC graded coins tend to sell for 20-40%, and very rarely over 50% of the prices listed in the book.</p><p><br /></p><p>So I figured that I might get a better indication of accurate values if I updating the spreadsheet with prices listed at the NGC site, and that&#039;s when things got weird! I went through all of the coins in each of the denominations, and the prices listed by NGC are the same as those listed in the book. I&#039;m not talking about similar, I mean number for number exactly the same for each grade of every coin! This obviously means that either the book copied NGC&#039;s list, NGC copied the book, or they both copied the same source. NGC states on their website that their price guides are maintained by Numismedia, and and the publishers of the book are Numismaster. I&#039;m not sure if these organizations are one in the same, but if they were then I guess this would make more sense.</p><p><br /></p><p>But what doesn&#039;t make sense is that the book was published in 2009, and it is now 2012. Am I led to believe that there has been zero market fluctuation over that time? I understand that tracking Mexican coins is probably more difficult, and not as profitable as actively tracking US coins. But 3 years? Since I purchased my book the 2011, 2012, and 2013 versions have been published. I&#039;d be curious to see whether Mexican coin prices have been modified at all from issue to issue, or whether US coin prices have changed for that matter.</p><p><br /></p><p>-Are the price guides at the TPG websites not based on sales data for that company&#039;s graded coins?</p><p><br /></p><p>-Why the discrepancy between price guide-sale price of Mexican coins? Have they taken a dive recently? Or were these price guides never accurate to begin with?</p><p><br /></p><p>-Should these findings reflect on the trustworthiness of US coin price guides (Greysheet, Redbook, etc)? I use these to determine what to spend on coins, and dealers use them to determine price. I would like to think that people are actively, continuously compiling data in support of these determinations.[/QUOTE]</p><p><br /></p>

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