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The decimal system refers to counting in tens and powers of tens and this system was used when Australia was colonised by Britain in 1788. Decimal coinage was introduced much later - in 1966.
All of these denominations beloing to the old redundant British predecimal currency system used by many of the British Empire/Commonwealth countries. 5 Guineas (105 Shillings) - converted to £5.25 in decimal currency. 2 Shillings (1 Forin) - converted to £0.10 in decimal currency. 2 Florins (4 Shillings) - converted to £0.20 in decimal currency. 12 Pence (1 Shilling) - converted to £0.05 in decimal currency.
Different countries changed at different times so you will need to specify which country.
That would be the Guinea, it was a gold coin and was equal to 21 shillings in the British pre-decimal system.
decimal system