 This time these new notes appeared to have been more successful, as they were issued for almost 20 years until finally being withdrawn on January 4, 1971.The final 500 yen notes are referred to as "series C" notes, and were issued starting on November 1, 1969 with new watermarks to enhance security.The issue came to an end on April 1, 1994 when 500 yen notes were withdrawn from circulation.