《资治通鉴·汉纪·汉纪二十八》
五月间，改铸货币：错刀，一枚值五千钱；契刀，一枚值五百钱；大钱，一枚值五十钱，跟五铢钱同时流通。
五月，更造货：错刀，一直五千；契刀，一直五百；大钱，一直五十。
In May, the currency was recast: Cuo Knife, one worth five thousand coins; Qi Knife, one worth five hundred coins; Big Coin, one worth fifty coins, circulated at the same time as the Five Zhu coins. 