《明史·志·卷五十七》
兵部尚书王象干，奏请铸造以一当十、以一当百、以一当干的三等面值大的钱，装饰龙纹，大约照白金三品的规定，于是两京都铸大钱。
兵部尚书王象乾，请铸当十、当百、当千三等大钱，用龙文，略仿白金三品之制，於是两京皆铸大钱。
Wang Xianggan, the Minister of the Ministry of War, requested to cast three values of coins, namely, one coin for ten, one coin for hundred, and one coin for thousand, and engraved them with dragon patterns, almost according to the regulations of the third grade of platinum, so large coins were cast in both capitals.