Australia 1859 Half Sovereign PCGS F12
Despite being a substantial year of production, 1859 remains a harder grade to collect, especially in higher grades. Only fourteen examples are available in PCGS grades.
Walter Eigner has more on the coin in the following link: http://numistip.com/Museum/1859_Half_Sovereign_573.html
You can verify the certificate of this coin by clicking on the following link (opens in new tab):