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<p>[QUOTE=&quot;Conder101, post: 5410047, member: 66&quot;]To continue with what DEA said, R.S. Yeoman wrote two books cataloging world coins by type Coins of the World (the brown book) covered coins from 1860 to 1960, and Modern Coins of the World (the white book) that covered 1960 - about 1974 or so.&nbsp; In both of these each coin type was cataloged with a Y# with each country starting in the brown book with Y# 1 and proceeding onward.&nbsp; </p><p><br /></p><p>When Krause came out with the Standard Catalog of World Coins in 1972 it also used the Y# cataloging system at first.&nbsp; (For coins before 1860 they used the C#&#039;s from William Craig&#039;s book Coins of the World 1750 to 1850)&nbsp; But over the years slowly started switching countries from the Y#&#039;s to their own KM #&#039;s.&nbsp; I&#039;m not sure but I believe the only place the Standard Catalog still used Y#&#039;s is for some of the Chinese coins.</p><p><br /></p><p>Now to throw a couple more wrenches into the works, the old Yeoman books went through several editions and with each of them one or more countries would get renumbered.&nbsp; I remember once Columbia went through two renumberings in a three year period.&nbsp; Then after most of the coins had been switched over to KM #&#039;s in the Standard Catalog, they came out with their 17th and 18th century books and then went back and renumbered EVERYTHING starting with KM #1 for each country in the 17th century book and proceeding forward.</p><p><br /></p><p>So if this is an old collection,if they didn&#039;t keep up withthe catalog numbering changes, the Y # may not really mean anything.&nbsp; This is a problem I&#039;m going to have when my father passes and I take full possession of the collection.&nbsp; The first thing I&#039;m going to have to do is recatalog the whole thing because I know there are coins in there still labeled with Y#&#039;s from almost 50 years ago that have been changed several times.&nbsp; (And that is going to take some time as there are over 24,000 different types in the collection.)[/QUOTE]</p><p><br /></p>

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