1st January 1901 was the birthday of Australia. The australian colonies and territories, with approval of the britisg Parliament, were united into one federation and could in 2001 celebrate the 100 years birthday.
The coin in this letter is a very special bi-Metallic coin with a star og pure gold in center and a ring of pure silver:
Specification of the coin::20 dollars bi-metallwith 8.86 g ,9999 gold and 10,76 g ,9999 silver.Weight: 19,63 gramsDiam: 32,1 mmMintage: 7500 coins