Australia 1881 Sydney Half Sovereign PCGS VG08
This coin is in another class of rarity. Walter Eigner of Numis Bid has counted approximately a dozen examples. That’s as rare as the 1856 type two and 1858 RR error half sovereigns.
PCGS has FIVE examples in its population report.
You can verify the certificate of this coin by clicking on the link below (opens in new tab):