Such a coin does not exist. The British Shilling was last minted for general circulation in 1966. The British Shilling was withdrawn and demonetised in 1990 along with the larger (23.5mm) 5 Pence coins it replaced.
A British 1970 Shilling (English reverse) (Proof FDC), uncirculated and in absolute mint condition could fetch up to £3 GBP. A British 1970 Shilling (Scottish reverse) (Proof FDC), uncirculated and in absolute mint condition could fetch up to £2 GBP. A reputable coin dealer will be able to give a more accurate valuation.
The British shilling came into use with the Act of Union with Scotland in 1707. Before that England and Scotland had their own shilling coins the use of which dates back to medieval times. The last actual coin was minted in 1966. The shilling remained in use, circulating side by side with the same sized 5 Pence coin that replaced it until 1991.
With the possible exception of traders tokens (with the traders business name on them), there were no "Australian" Farthings ever produced. The only Farthings to ever circulate in Australia were British Farthings.
You need to provide the year. Without knowing the year it is impossible to value your coin. Crowns (5 shilling) pieces were minted in several different years and have vastly different values depending on what year they were minted in.
The pre-2000 Somali Five Shilling coin was made from a copper/nickel alloy. The post-2000 Somali Five Shilling (or Scellini) coin is made from aluminium.
Your question poses a small problem. No English coin was introduced in 1526 and no British coin was withdrawn in 1965. Many English coins circulating in or around 1526, were still circulating in one form or another in 1965. The "Testoon", later known as the "Shilling", was first minted in small quantities around 1489, but minted in much larger quantities from about 1544. The Shilling continued to circulate along side the 5 New Pence and 5 Pence coins until 1990 when all coins were replace with a smaller 5 Pence coin.
Jersey only ever produced a Five Shilling coin in 1966. The concept of a "Shilling" ceased with the introduction of decimal currency in 1971.
The 1927 British Florin (Two Shillings) was not issued as a general circulation coin, it was only released as a "Proof FDC" and a "Matt Proof FDC" coin and there were only 15,000 minted. The Matt Proof FDC coin is described as being of the highest rarity. The Proof FDC coin would perhaps be described as being scarce.
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A shilling was a coin in British currency until 1971. It's value at decimalisation was 5 new pence.
Not much