▁until ▁ 1 5 0 3 . ▁ ▁Y ong le ▁T ong ba o ▁c ash ▁co ins ▁were ▁mostly ▁cast ▁for ▁foreign ▁trade . ▁ ▁From ▁the ▁M ing ▁dynast y ▁on wards ▁only ▁period ▁titles ▁were ▁used ▁for ▁coin ▁ins cri ptions ▁and ▁these ▁period ▁titles ▁would ▁( us ually ) ▁remain ▁constant ▁throughout ▁the ▁reign ▁of ▁an ▁Emperor . ▁ ▁Note ▁that ▁under ▁the ▁reign ▁of ▁the ▁Zh eng de ▁Emperor ▁no ▁co pper - al loy ▁c ash ▁co ins ▁were ▁mint ed ▁however ▁a ▁very ▁large ▁number ▁of ▁Zh eng de ▁T ong ba o ▁( 正 德 通 <0xE5> <0xAF> <0xB6> ) ▁coin ▁am u lets ▁exist , ▁the ▁production ▁of ▁these ▁coin - like ▁am u lets ▁started ▁from ▁the ▁late ▁M ing ▁dynast y ▁period ▁and ▁these ▁am u lets ▁are ▁still ▁being ▁produced ▁today . ▁ ▁Gu iz hou ▁local ▁issues ▁▁ ▁During ▁the ▁Hong z hi ▁period ▁from ▁ 1 4 8 8 ▁until ▁ 1 5 0 5 ▁some ▁Trib al ▁Commission ers ▁in ▁the ▁province ▁of ▁Gu iz hou ▁issued ▁their ▁own ▁c ash ▁co ins , ▁rather ▁than ▁being ▁bases ▁on ▁reign ▁titles ▁the ▁ins cri ptions ▁were ▁based ▁on ▁place ▁names . ▁ ▁Y unn an ▁local ▁issues ▁▁ ▁Under ▁the ▁M ing ▁dynast y ▁the ▁territory ▁which ▁used ▁to ▁belong ▁to ▁the ▁D ali ▁Kingdom ▁cast ▁their ▁own ▁co ins , ▁these ▁c ash ▁co ins ▁were ▁issued ▁in ▁the ▁province ▁of ▁Y unn an ▁under ▁the