Signatures are the easiest way for paper notes. For example. Coombes/Wilson paper notes, say $1 COA is 1966 issue. Polymer is usally signatures and the first 2 numbers of the serial numbers for most issues. Example is for a $10 note, Mcfarlane/Henry AA02 is for 2002. This may help.. http://www.rba.gov.au/CurrencyNotes/
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