The most complex period for coins was in the reign of Chung-chen (1628-1644), last emperor of the Ming dynasty, with numerous different weights, widths, lettering, and shapes. One particularly special one had a galloping horse on the reverse side.
明代崇禎錢算是歷代錢幣中最複雜者，文字、形狀、大小、厚薄以及輕重各不相同，其中有枚形制很特殊，錢背面有一匹奔馬，俗稱「跑馬崇禎」。