From 1991 to 2015 the Peruvian currency was known as new Sun. However, from that year on, it returned to its original name: sun. As a consequence, the design of the different coins was renewed. You have all the information in: «The Peruvian sol: history and value of the currency of Peru«.
You have all the information in: "The Peruvian sol: history and value of the currency of Peru".