Nice find gxseries! 
According to https://www.australian-coins.com/er...50-cent-50c/
'Whatever the cause of this error it's an interesting one and the mintage is likely to be only one production die run or less. This could mean that just 200,000 or less of this variety exist.'
They have been fetching just over $50 lately.


According to https://www.australian-coins.com/er...50-cent-50c/
'Whatever the cause of this error it's an interesting one and the mintage is likely to be only one production die run or less. This could mean that just 200,000 or less of this variety exist.'
They have been fetching just over $50 lately.
