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<p>[QUOTE="Numbers, post: 3377468, member: 11668"]These days, that's correct: the FRB letter runs from A to L, and the block letter runs from A to Y (minus O, but plus *). So there are 12x25=300 possible blocks, though most series use well under half of them.</p><p><br /></p><p>In the old days, the alphabet included Z, and since the silver certificates and such didn't have FRB designations, they could use the full alphabet in both prefix and suffix positions. That allowed for 650 possible blocks, including stars, but fewer than 200 were actually used in practice.</p><p><br /></p><p>Back on topic: I think the demand (and hence the monetary value) for any particular serial number will depend mostly on how many people would recognize it as something special. So numbers like 00000001 and 12345678 will always be expensive, while something like your 17530625 example would probably sell for a few bucks tops.</p><p><br /></p><p>On the other hand, the more collectors are willing to pay for a certain item, the more dealers are willing to put effort into finding it for them. As a result, you could probably buy a dozen 00000001 notes this month if you had the money to pay for them, but good luck ever finding 17530625 for sale.</p><p><br /></p><p>Your examples of pi and e are likely somewhere in between. Someplace I've got a note that I saved from circulation because the first five digits were 31415xxx, so I can confirm that some folks actually look for pi. If the full 31415926 ever comes up for sale, I very much doubt that you'll get it for $10 or even $20...but for that very reason, it wouldn't surprise me if such a note actually came up for sale at some point.</p><p><br /></p><p>(Side note: The serial number I'd really like to find is 09699690, which is of interest to both currency collectors *and* math nerds....)[/QUOTE]</p><p><br /></p>
[QUOTE="Numbers, post: 3377468, member: 11668"]These days, that's correct: the FRB letter runs from A to L, and the block letter runs from A to Y (minus O, but plus *). So there are 12x25=300 possible blocks, though most series use well under half of them. In the old days, the alphabet included Z, and since the silver certificates and such didn't have FRB designations, they could use the full alphabet in both prefix and suffix positions. That allowed for 650 possible blocks, including stars, but fewer than 200 were actually used in practice. Back on topic: I think the demand (and hence the monetary value) for any particular serial number will depend mostly on how many people would recognize it as something special. So numbers like 00000001 and 12345678 will always be expensive, while something like your 17530625 example would probably sell for a few bucks tops. On the other hand, the more collectors are willing to pay for a certain item, the more dealers are willing to put effort into finding it for them. As a result, you could probably buy a dozen 00000001 notes this month if you had the money to pay for them, but good luck ever finding 17530625 for sale. Your examples of pi and e are likely somewhere in between. Someplace I've got a note that I saved from circulation because the first five digits were 31415xxx, so I can confirm that some folks actually look for pi. If the full 31415926 ever comes up for sale, I very much doubt that you'll get it for $10 or even $20...but for that very reason, it wouldn't surprise me if such a note actually came up for sale at some point. (Side note: The serial number I'd really like to find is 09699690, which is of interest to both currency collectors *and* math nerds....)[/QUOTE]
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