Although Federation occurred in 1901, it wasn't until 1910 that Australia's first official coinage was struck. In 1910 the Royal mint London struck threepence, sixpence, shillings and florins with the copper penny and half penny coins struck in 1911. The first silver coins featured the Australian Coat of Arms on the reverse bearing Australia's iconic Kangaroo and Emu holding up a shield beneath the Federation Star with the wording Advance Australia on a scroll down below. The copper coins featured a partitioned inner circle with Commonwealth of Australia around the outside and the denomination in the middle.
These designs would later be updated with Kruger Gray designs in 1939 for the Half penny, 1938 for the other denominations except the sixpence which retained its original design. The half penny and penny feature a kangaroo, the threepence wheat stalks, the shilling a ram and the florin an updated Coat of Arms design. A crown was also struck in 1937 and 1938 featuring the British crown on the reverse.
Commonwealth coinage was the primary medium of exchange from 1910 to 1965 until the coinage was replaced with Australian decimal coinage.