Cook Islands 2013 $1 Lunar Calendar Year of The Snake 1oz Silver Coloured Proof 4 Rectangle Coin SetThe reverse of each coin celebrates the 2013 Year of the Snake with a specific species of snake representing each colour The designs include separate representations of the Blue Lipped Sea Krait, the Yellow Banded Wolf Snake, the Red Bamboo Rat Snake and the Chinese Green Tree Viper. The Chinese character for snake and The Perth Mints traditional P mintmark are also included in the design.