The PNC released by Australia Post is just one release in a series of stamps and first day covers. It features one 60c stamp postmarked in Canberra 2600 on the date of issue July 27th 2010.
PNC: Abbreviation of philatelic-numismatic combination (or cover). A combination of a coin, medal, token or other numismatic item inserted into an envelope that is postmarked on a special occasion, ...
PNC
Postal Numismatic Cover - A joint issue of postal (philatelic) and currency (numismatic) items, for example a coin and postage stamp first day cover.
PT ...
Plate Number Coils (PNC)
For most coil stamp rolls beginning with #1891, a small plate number appears at varying intervals in the roll in the design of the stamp.
Examples of times when currently dated coins, might be preferred would be if a coin is pressed on a birthday visit, is a special issue for a person’s retirement or is part of a dated PNC issue etc.
 See also: Numismatic, Mint, Dollar, Struck, Coin
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