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Message:: [QUOTE="900fine, post: 343404, member: 6036"]Minor point of semantics - the first number (in this case, 7524) is the issue, not the series. A series is also known as type - for instance, "type I gold dollars". An issue is a particular item (date / mint / variety) within the series - in this case, 1853-O. So the first number, 7524, tells you it is an 1853-O gold $1. This matches the ID numbers on their census report (available only by subscription). The second number is the numerical grade (in this case, 63). The third number is the unique certificate number (i.e. a serial number). So there will be many slabs with the 7524.63 part, because there are several MS63 1853-O gold $1s. But only one will have the /05893056 part. To make it a little more complicated, the first number varies depending on whether or not it is a business issue (MS, MS-PL, MS-DMPL), or proof (PR, PR-cam, PR-dcam). So the 1884-P gold dollars have several IDs : MS ID = 7585PR ID = 7634PR cameo ID = 87634PR deep cameo ID = 97634 Clear as mud ![/QUOTE]