<Li> 1981: During production of Series 1977A, a few star notes from the Richmond FRB were made on experimental Natick paper, in the only experimental note series not involving the $1 bill . </Li> <Li> 1992: The first modern anti-counterfeiting measures were introduced with microscopic printing around Hamilton's portrait and a plastic security strip on the left side of the bill . Even though the notes read Series 1990, the first bills were printed in July 1992 . </Li> <Li> May 24, 2000: To combat evolving counterfeiting, a new $10 bill was issued under series 1999 whose design was similar in style to the $100, $50, $20, and $5 bills that had all undergone previous design changes . The major changes were a revised portrait of Hamilton and a revised vignette of the U.S. Treasury building, now facing front . The plastic security strip reads "USA TEN" and now glows orange under a black light . Like the new $5, the bills were first printed in December 1999 . </Li> <Li> March 2, 2006: In addition to design changes introduced in 2000, the obverse features red background images of the Statue of Liberty's torch, the phrase WE THE PEOPLE from the United States Constitution, a smaller metallic representation of the Statue of Liberty's torch, orange and yellow background color, a borderless portrait of Hamilton, and to the left of Hamilton small yellow 10s whose zeros form the EURion constellation . The reverse features small yellow EURion 10s and have the fine lines removed from around the vignette of the United States Treasury building . These notes were issued in series 2004A with Cabral - Snow signatures . The first notes were printed in July 2005 . </Li>

When did the us start putting strips in money