Australia 1920 Penny Dot Below PCGS MS63
An excellent example of a “clone die” marked coin from Melbourne Mint, as Australia abruptly learnt to manufacture their own working dies following World War 1. See the following articles for further research on the die variants of this period.
http://www.numismatics.org.au/pdfjournal/Vol20/Vol%2020%20Article%204.pdf
http://www.numismatics.org.au/pdfjournal/Vol28/naa-journal-vol-28-holland.pdf
The certificate of the coin can be verified by clicking on the following button (opens in new link):
