Australia 1871S Small BP Sovereign PCGS AU58: S-3858A, with small B.P initials. You can find the large B.P version here:
https://topendcoins.com.au/product/australia-1871-sydney-sovereign-large-bp-pcgs-au55/
A touch short of non-circulated condition, yet still rare in this grade. A key date coin.
You can verify the certificate of this coin by clicking on the button below:
