Australia 1860 Sydney Half Sovereign PCGS XF45
After 1855, it is this date that is the scarcest wreathed head Sydney Mint half sovereign. This example may be the only XF or better coin available on the market for less than $10,000.
From this sole graded coin in XF45, one example exists in AU50, followed by 2 coins in AU55 and 4 in AU58. I seriously doubt those three grades would be available in the future for less than $10,000. Below this grade only VF coins are to be found at present.