New York. DuraNote Advertising Note ND (ca.1989-1994), Uncut Sheet of 4 Intaglio Printed Polymer Sample Notes With Security Devices. U.S. & Canada, ND (ca.1988-1994). P-unlisted. 100 denomination. Uncut block of 4, "DuraNote" Polymer banknotes similar to Tyvek polymer material. Red brown on light green undertint. Face has ocean oil well drilling platform with ornate designs and back has light multi-colored cycloid security undertint only. CU to Gem Uncirculated condition. Rare as a block of 4. These DuraNote Specimen/Proofs were part of an experimental test for using a petroleum alternative to paper by using petroleum based polymer substrate material. This was a project by Mobil Oil Company that was abandoned when the company was acquired in the late 1990s.