Ok, I was searching
ebay for a 1966 20c wavy, and found this. I remember reading about someone being offered $4,500 for an UNC one. This seems to be aUnc-Unc, going for $2,500.
http://www.ebay.com/itm/AUSTRALIAN-...em3f15543bdaAlso I'm not to sure but it does look a little cleaned to me on the left side of the obverse? So be careful :)