cash chinese coins collection collectors currency display historic holy coins large metal money old old currency Sizes small square square holes textures appearance aussie Australian banknotes color colored colors colour coloured colours decimal-currency finance history low-value monetary notes numismatics obverse outdated pre-decimal-currency replaced security superceded superseded value values reverse coin dosh heads silver tails tender thripeny abolished banknote burma Burmese Central-Bank-of-Myanmar dollars exchange exchanging FEC foreign-currency Foreign-Exchange-Certificate invalid Myanmar phased-out USA-dollar-values kyats decimal denominations low-denominations not-in-circulation paper-money success variations variety wealth