Lunar Year of the Snake. Perth Mint's Australian Lunar Series III collection continues the rich tradition of minting spectacular bullion coins by portraying animal themes from the Chinese lunar calendar. The reverse design changes each year based on the Chinese lunar calendar, and the 2025 reverse celebrates the Year of the Snake. Those born under the sign of the Chinese lunar snake in 2025, 2013, 2001, 1989, 1977 and every 12th preceding year are said to be deep thinkers, mysterious, determined and caring.