Australia 1880 Sydney Half Sovereign PCGS AU50 (type 5/3)
The mint marks observed suggest one die only for this variety. Rarer than 1883 Sydney and only two coins are graded finer than this one.
More information can be found in the following research: https://topendcoins.com.au/wp-content/uploads/2020/04/1882m-the-sixth-head.pdf
Verify the coin at PCGS’s website by clicking on the link below: