@Bron
I agree in so far that these examples of bad quality delivered by the mint(s) must not happen!
It is possibly it did not happen in this case (10oz as posted before) at the mint. But shit happens...sorry for that expression but I can proof it.
But is also an opportunity for Perth Mint to improve your quality inspection and system!
Last year at World Money Fair in Berlin I had a meeting with Ron Currie, your former Marketing and Sales Director.
I showed him two Koala Perth Mint silver coins with misstrikes which should not have passed the quality control but they have passed it!
Human beeings are no machines and even a quality system does not prevent from mistakes.
After Ron has inspected these two diifferent coins (one is a 1oz Koala High Relief of 2012 and one is a bullion Koala 1oz of 2013.
On the first coins there seems to be a add on of silver which came on the blanket or was on it already as the striking started.
The 2013 misstrike was due to you former used masking technique of striking a coin serveral times as Ron explained.
This process has changed after that coinage he remarked. The 2012 proof-misstrike seems to be a single fault and the "masking" fault
has happerd at least for about 100 coins. The guy who presented them to me bought 4 tubes. And about half of them are looking like the following
pictures no. 3 to 5. I own two of them as an evidence.
The "add on" is at the "I" at Australia:
And the two extending lines below 2013 are shown here:
If you are attending WMF 2016 in Berlin I can arrange a meeting with you to present you the 2013 koala coin.