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2000 Silver Kookaburra MARS Privy MS69
Kookaburra facing left, sitting on an almost horizontal branch with 18 leaves to the left
4th portrait of Queen Elizabeth II facing right wearing the Girls of Great Britain and Ireland Tiara, engraver (IRB) Ian Rank-Broadley, ELIZABETH II AUSTRALIA • 1 DOLLAR
Mars Privy Mark - Calendar Set
The calendar of the Roman Republic followed Greek calendars in assuming a lunar cycle of 29+1⁄2 days and a solar year of 12+1⁄2 synodic months (368+3⁄4 days), which align every fourth year after the addition of two intercalary months.Two months were added at the end of the year to complete the cycle during winter, January and February, before the intercalary month inserted every two years; the intercalary month was sometimes known as Mercedonius
Maximum mintage for the 12 coins of the calendar set was 5'000.