With the issuance of small-sized notes in 1929, a portrait of Benjamin Franklin again appeared on the face of the $100 note. Independence Hall in Philadelphia, Pennsylvania, was selected for the back. Over time, minor design modifications were made. In 1966, the words, “In God We Trust,” were added to the back and, starting with Series 1990 notes, a security thread in the paper and microprinting were added.
The Series 1996 note featured a new, enlarged portrait of Benjamin Franklin. It was based on a circa 1785 painting by Joseph Siffred Duplessis. The image of Independence Hall remained essentially the same but was set within a simplified oval background. Additional anti-counterfeiting features included a watermark and color shifting inks.