Convert from fotmal [lead] to chin [China]

Unit Definition (fotmal [lead])
The fotmal is a traditional English unit of weight for lead. In medieval England the fotmal was equal to 70 "mercantile" pounds, which is equivalent to 72 avoirdupois pounds.

Unit Definition (chin [China])
The chin [China] is one of several spellings in English for the jin, a traditional Chinese weight unit.