▁and ▁are ▁univers ally ▁accepted . ▁ ▁A ▁comm emor ative ▁polym er ▁ 5 0 - đ ồ ng ▁bank note ▁dedicated ▁to ▁the ▁f ift i eth ▁anni versary ▁of ▁the ▁State ▁Bank ▁of ▁Vietnam ▁was ▁issued ▁in ▁ 2 0 0 1 , ▁but ▁its ▁face ▁value ▁is ▁so ▁tiny ▁that ▁it ▁clearly ▁was ▁meant ▁only ▁for ▁collect ors . ▁The ▁note ▁is ▁available ▁in ▁three ▁forms , ▁by ▁itself , ▁in ▁a ▁presentation ▁folder ▁or ▁in ▁a ▁presentation ▁folder ▁in ▁an ▁en velope . ▁In ▁ 2 0 1 6 , ▁a ▁ 1 0 0 - đ ồ ng ▁bank note ▁was ▁issued ▁on ▁cot ton - based ▁paper ▁to ▁comm emor ate ▁the ▁ 6 5 th ▁anni versary ▁of ▁central ▁bank ing . ▁ ▁Bear er ' s ▁checks ▁ 1 9 9 2 – 2 0 0 2 ▁To ▁support ▁the ▁growing ▁industrial ▁need ▁for ▁large ▁money ▁transactions , ▁the ▁State ▁Bank ▁issued ▁" B ear er ' s ▁Check s " ▁or ▁" State ▁Bank ▁S ett lement ▁Check s " ▁( N g ân ▁Ph i ế u ▁Th anh ▁To án ) ▁in ▁denomin ations ▁from ▁ 1 0 0 , 0 0 0 ▁to ▁ 5 , 0 0 0 , 0 0 0 ▁ đ ồ ng . ▁To ▁prevent ▁counter fe iting , ▁these ▁notes ▁had ▁many ▁degrees ▁of ▁protection , ▁their ▁designs ▁were ▁changed ▁every ▁five ▁to ▁six ▁months , ▁and ▁they ▁had ▁exp iration ▁dates ▁five ▁or