Its hard to get excited about the COA 50c unless its a very low mintage. I managed to get about 100 mabo 50c and yes it was a low mintage of 1.1m. The federation coins of 2001 are collectable I have put together about a dozen sets. I found a few incuse 2000 coins too.
can't see anything wrong with this well circulated coin. I assume the damage to the queens face was the suspected potential error and that damage would have occurred after it had left the mint. PMD "post mint damage"
I assume FOR EX in Australia do not accept coins as they take up too much storage space. I saw a company in UK named left over currency that buys back coins and bank notes even if demonetised. Was thinking of sending some coins and banknotes in well circulated condition. Has anyone used their services?