According to the year number, such as "Daming Xuande Year System" and "Qing Kangxi Year System". The other is heavenly stems and earthly branches combination.
It is called the year of dry branch, such as "Bing Yin Ji Dan" and "Gan Long Wu Bing". Official kiln porcelain is the highest in history.
However, some folk kilns also have models that write the year. The font of the year number of the folk kiln is scrawled, which is far less regular than that of the official kiln. Chronology of dry branches for porcelain
There are many kinds of money in Ming and Qing Dynasties.