Plate Check Number Error?

This should help:

The face plate number identifies the particular printing plate which was used to print the face side of a note. Similarly, the back plate number (not visible in the above scans) identifies the plate used for the back side of the note. In recent years, the numbering of printing plates has started over from #1 in each new series, so the plate numbers rarely get higher than a few hundred. Formerly, however, the practice was to number the plates sequentially across many series, so that four-digit plate numbers were not uncommon.

http://www.uspapermoney.info/general/note.html
Ty