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Message:: [QUOTE="Numbers, post: 577530, member: 11668"]More specifically, the first 100,000,000 notes printed used this configuration.  These are the "plain" block notes, with no letters at all in the serial number.  The date-below-serial configuration began to be used at the start of the second block, with "A" serial numbers. Incidentally, if you enjoy varieties, you can collect the four different serial formats that exist in this series: <ol> <li>the "plain" block, without letters.</li> <li>the single-letter blocks, with a prefix letter but no suffix letter.</li> <li>the double-letter blocks, with matching prefix and suffix letters.</li> <li>the "A"-suffix blocks, with suffix "A" and nonmatching prefix letter.</li> </ol>It's an interesting sequence, showing how the BEP had to keep coming up with new block patterns to keep printing more and more notes over the twenty-odd years that this series was in production.  (If you like, you can throw in a star note too; they're all *..B block in this series, no matter which of the above serial formats they were printed to replace.)[/QUOTE]