1981 20c - Canberra And Wales Coins

Thanks Steve. After looking at the links and other linked resources I have decided to leave the Canberra vs Wales issue aside. There is just too much uncertainty and worst of all, even if one could definitely describe conistant differences, there is still no way of knowing if those differences reflect different mints. Unless the original dies from the mints or specimens known to originate in each mint are examined I can't see how this can be resolved.