Australia 1919 Dot Below Scroll Melbourne Penny PCGS MS64
Equal finest in a group of nine coins, with only two coins finer in grade than this. A scarce, high grade example.
A very complete numismatic article on the various mint marks made in 1919 and 1920 can be read here: https://tinyurl.com/ya79h4fd
The certificate of this coin can be verified in the following link: https://www.pcgs.com/cert/34983367