In the B.C.O.F. overprints the font "6" error exists with the ½d orange kangaroo; the 6d dull brown kookaburra and the 1/- dull green lyrebird; the common term for this wrong font is known as an "antique 6".
Showing are two of the 3 values, 6d and 1/-, the ½d is seldom seen on the market. The top stamp of the 1/- lyrebird shows the correct font, all 3 errors are scarce.
The 2015 CV value of these two errors combined is $950.
Rob
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this post "Specialised Collector of Australian Pre-Decimal & Decimal Stamps"