Bingqian

Bingqian (Traditional Chinese: 餅錢; Simplified Chinese: 饼钱; Pinyin: ''bǐng qián''), or ''Bingxingqian'' (), is a term, which translates into English as "biscuit coins", "pie coins", or "cake coins", used by mainland Chinese and Taiwanese coin collectors to refer to cash coins with an extremely broad rim, as these cash coins can be very thick. However, the earliest versions of the Bingqian did not have extraordinarily broad rims.

These cash coins were produced during two distinct periods in Chinese history, first they were produced under Emperor Wang Mang of the Xin dynasty and later again during the reign of Emperor Zhenzong of the Northern Song dynasty. Only a very small quantity of Chinese cash coins were ever produced that had these very broad rims and/or had a very thick composition.

While there have been speculations about their use, the purpose of these broad rimmed cash coins have yet to be determined. Provided by Wikipedia