. ▁ ▁South ▁Vietnam ▁▁▁ ▁Notes ▁du ally ▁denomin ated ▁in ▁pi as tres ▁and ▁ đ ồ ng ▁were ▁issued ▁in ▁ 1 9 5 3 ▁for ▁the ▁State ▁of ▁Vietnam , ▁which ▁evol ved ▁into ▁South ▁Vietnam ▁in ▁ 1 9 5 4 . ▁On ▁September ▁ 2 2 , ▁ 1 9 7 5 , ▁after ▁the ▁fall ▁of ▁Sa ig on , ▁the ▁currency ▁in ▁South ▁Vietnam ▁was ▁changed ▁to ▁a ▁" li ber ation ▁ đ ồ ng '' ▁worth ▁ 5 0 0 ▁old ▁Southern ▁ đ ồ ng . ▁ ▁United ▁Vietnam ▁After ▁Vietnam ▁was ▁reun ified , ▁the ▁ đ ồ ng ▁was ▁also ▁un ified , ▁on ▁May ▁ 3 , ▁ 1 9 7 8 . ▁One ▁new ▁ đ ồ ng ▁equ alled ▁one ▁Northern ▁ đ ồ ng ▁or ▁ 0 . 8 ▁Southern ▁" li ber ation " ▁ đ ồ ng . ▁ ▁On ▁September ▁ 1 4 , ▁ 1 9 8 5 , ▁the ▁ đ ồ ng ▁was ▁re valu ed , ▁with ▁the ▁new ▁ đ ồ ng ▁worth ▁ 1 0 ▁old ▁ đ ồ ng . ▁This ▁started ▁a ▁cycle ▁of ▁chron ic ▁infl ation ▁that ▁continued ▁through ▁much ▁of ▁the ▁early ▁ 1 9 9 0 s . ▁ ▁Co ins ▁ ▁For ▁the ▁earlier ▁modern ▁Vietnam ese ▁co ins , ▁please ▁see ▁North ▁Vietnam ese ▁ đ ồ ng ▁or ▁South ▁Vietnam ese ▁ đ ồ ng . ▁ ▁First ▁