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NessunDorma
Hey guys, I have a quick question for you: when looking at SC block numbers, is it assumed that the notes were issued in consecutive alphabetical order (ie. A-block was printed before B-block which came before C-block, etc.)? I still have so much to learn about early US currency and I know you will point me in the right direction. Cheers.
Collector of United States Currency, fine mechanical watches & fridge magnets
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Steve in Tampa

Basically yes, but some series serial numbers continued from where the previous series left off. In other words, a change in series does not guarantee an A-A block. The Standard Guide to Small-Size US Paper Money is a good reference or you can view a top registry set of $1 SC’s to view blocks.

https://notes.www.collectors-society.com/registry/notes/mysets_listing.aspx?PeopleSetID=2755

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EarlySmallSizeFanatic
And experimental ranges are printed out of sequence for the most part as well. 

The 1935 $1 SC's: AB experimental was printed alongside the GA block. BB was printed with the end of the KA block, and the CB block started the same day as the LA block. 
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larry510

Basically yes, but some series serial numbers continued from where the previous series left off. In other words, a change in series does not guarantee an A-A block. The Standard Guide to Small-Size US Paper Money is a good reference or you can view a top registry set of $1 SC’s to view blocks.

https://notes.www.collectors-society.com/registry/notes/mysets_listing.aspx?PeopleSetID=2755



The $1 1957A series SC was an oddity.  It started over at AA when it could have continued where the 1957 plain series left off (BB block).  This bucked all previous trends of small size $1 silver certificates.  Even the 1957B started where the 1957A ended (QA block)
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