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THIS IS AUSTRALIA 1970 50 CENTS, Captain Cook's Australian Voyage UNC

Composition     Copper-nickel (75% Copper, 25% Nickel)
Weight     15.55 g
Diameter     31.51 mm
Thickness     3 mm
Shape     Dodecagonal (12-sided)
Technique     Milled
Orientation     Medal alignment ↑↑
References     KM# 69

YES WE DO COMBINE POSTAGE