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Message:: [QUOTE="Notaphylic_C, post: 8261769, member: 130786"][USER=11668]@Numbers[/USER] has deftly articulated how plate #'s work (that they identify the position of the note on the sheet & which plate was used).  It can be relevant:a) to identify <a href="https://www.cointalk.com/threads/web-press-web-fed-notes.389523/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/web-press-web-fed-notes.389523/">WEB pressed notes</a> as discussed in that thread (where the plate # is actually in a different position (take a look at the thread)b) to identify errors (as [USER=11668]@Numbers[/USER] explained) once an error has been identified the plate # are usually noted & the search to find others kicks into gearc) to identify "mules" Think of a "mule" as a mix breed note where the backplate was too worn to continue & another substitute back plate had to be employed.  Usually the 'experts' document what back plate numbers to look out for.  I used to think that the back plate numbers were high for mules but saw on another forum, this isn't necessarily the case (they're documented in the catalogues). So, I'm just learning about "mules" & if there's anybody else out there who'd like to add- please do.[/QUOTE]