100 Dollars With black bars

The "black bars" designation refers to an overprint applied to the standard 2006 series note — a relatively rare intervention in which bars were printed over portions of the design, most commonly associated with a demonetization hold or a controlled release pending a replacement issue. De La Rue applied the base printing, but the bars themselves may have been added locally or under separate contract.

P-51 variants with the bar overprint are scarcer in circulation than the unmodified type, and the exact administrative reason for the overprint has not been uniformly documented across major catalogs.