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<p>[QUOTE=&quot;Numbers, post: 1751675, member: 11668&quot;]No, that&#039;s not what a mule is.</p><p>&nbsp;</p><p>A mule is a transitional variety.&nbsp; The BEP makes some change that affects both sides of the notes, but they&#039;re sloppy during the changeover, and so some notes get printed with old faces and new backs, or new faces and old backs.&nbsp; Those are mules.</p><p>&nbsp;</p><p>The best-known mules are the Julian-Morgenthau notes like Timewarp posted.&nbsp; The BEP enlarged the font size of the plate numbers, on both face and back.&nbsp; So a note with a large FP number and small BP number, or vice versa, is a mule.</p><p>&nbsp;</p><p>In other eras, other changes led to mules.&nbsp; Some large-size-note mules are defined by changes in the location of the plate number: a mule is a note with the FP number in the new location and the BP number in the old location, or vice versa.&nbsp; The 1977A/1981 $1 FRN mules are defined by a reset of the plate numbering: a mule is a note with a four-digit FP number and a low BP number, or vice versa.&nbsp; Notice that in these cases, mules have nothing to do with the font size of the plate numbers.</p><p>&nbsp;</p><p>Silent&#039;s two notes are not mules.&nbsp; These days, the BEP uses the font size of the plate numbers to *mean* something: the large BP number means that the note was printed at Fort Worth, and the large FP number on a $20 means that the note was printed on the new SOI presses.&nbsp; There&#039;s no transition going on here--these notes weren&#039;t printed with &quot;old&quot; faces and &quot;new&quot; backs, or vice versa--so these notes can&#039;t be mules.[/QUOTE]</p><p><br /></p>

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