appearance banknote burma Burmese cash color colored colors colour coloured colours currency finance historic history kyats low-value monetary money Myanmar notes numismatics old outdated replaced security superceded superseded textures value values aussie Australian banknotes decimal-currency obverse pre-decimal-currency reverse banknote-features changes collectors decimal denominations dollars features five-dollars introduced monetary-value New plastic potential replacing success superceding superseding variations variety wealth abolished Central-Bank-of-Myanmar exchange exchanging FEC foreign-currency Foreign-Exchange-Certificate invalid phased-out USA-dollar-values