<Li> 1963: Because dollar bills were no longer redeemable in silver, beginning with Series 1963A, WILL PAY TO THE BEARER ON DEMAND was removed from the obverse of the $100 Federal Reserve Note and the obligation was shortened to its current wording, THIS NOTE IS LEGAL TENDER FOR ALL DEBTS, PUBLIC AND PRIVATE . Also, IN GOD WE TRUST was added to the reverse . </Li> <Li> 1966: The first and only small - sized $100 United States Note was issued with a red seal and serial numbers . It was the first of all United States currency to use the new U.S. treasury seal with wording in English instead of Latin . Like the Series 1963 $2 and $5 United States Notes, it lacked WILL PAY TO THE BEARER ON DEMAND on the obverse and featured the motto IN GOD WE TRUST on the reverse . The $100 United States Note was issued due to legislation that specified a certain dollar amount of United States Notes that were to remain in circulation . Because the $2 and $5 United States Notes were soon to be discontinued, the dollar amount of United States Notes would drop, thus warranting the issuing of this note . </Li> <Li> 1990: The first new - age anti-counterfeiting measures were introduced under Series 1990 with microscopic printing around Franklin's portrait and a metallic security strip on the left side of the bill . </Li> <Li> March 25, 1996: The first major design change since 1929 took place with the adoption of a contemporary style layout . The main intent of the new design was to deter counterfeiting . New security features included a watermark of Franklin to the right side of the bill, optically variable ink (OVI) that changed from green to black when viewed at different angles, a higher quality and enlarged portrait of Franklin, and hard - to - reproduce fine line printing around Franklin's portrait and Independence Hall . Older security features such as interwoven red and blue silk fibers, microprinting, and a plastic security thread (which now glows pink (nominally red) under a black light) were kept . The individual Federal Reserve Bank Seal was changed to a unified Federal Reserve Seal along with an additional prefix letter being added to the serial number, w . The first of the Series 1996 bills were produced in October 1995 . </Li>

When did they start putting security strips in money