▁nick el - cl ad ▁steel ▁or ▁br ass - cl ad ▁steel . ▁Prior ▁to ▁its ▁re int roduction , ▁Vietnam ese ▁consum ers ▁had ▁to ▁exchange ▁bank notes ▁for ▁tokens ▁with ▁a ▁cl erk ▁before ▁purch asing ▁goods ▁from ▁v ending ▁machines . ▁This ▁was ▁also ▁to ▁help ▁the ▁state ▁ease ▁the ▁cost ▁of ▁producing ▁large ▁quantities ▁of ▁small ▁den om ination ▁bank notes ▁which ▁t ended ▁to ▁wear ▁hard ▁after ▁every ▁transaction . ▁Many ▁residents ▁expressed ▁excitement ▁at ▁seeing ▁co ins ▁re app ear ▁after ▁many ▁years , ▁as ▁well ▁as ▁concern ▁for ▁the ▁limited ▁useful ness ▁of ▁the ▁ 2 0 0 ▁ đ ồ ng ▁co ins ▁due ▁to ▁on going ▁infl ation ary ▁press ures . ▁ ▁Since ▁the ▁launch ▁of ▁the ▁ 2 0 0 3 ▁coin ▁series , ▁the ▁State ▁Bank ▁has ▁had ▁some ▁difficulties ▁with ▁making ▁the ▁accept ance ▁of ▁co ins ▁universal ▁despite ▁the ▁partial ▁dis continu ation ▁of ▁smaller ▁notes , ▁to ▁the ▁point ▁of ▁some ▁banks ▁ref using ▁coin ▁c ash ▁depos its ▁or ▁the ▁c ash ing ▁in ▁of ▁large ▁numbers ▁of ▁co ins . ▁This ▁has ▁prompt ed ▁laws ▁requiring ▁private ▁and ▁municipal ▁banks ▁to ▁trans act ▁and ▁offer ▁services ▁for ▁co ins ▁and ▁the ▁full ▁dis continu ation ▁of ▁small ▁den om ination ▁and ▁cot ton ▁based ▁notes . ▁ ▁Bank notes ▁ ▁First ▁ đ ồ ng ▁In ▁ 1 9 7 8 , ▁the ▁State ▁Bank ▁of ▁Vietnam ▁( N g ân ▁h à ng ▁N