Were there a lot of cloth springs in the Northern Zhou Dynasty?

Buquan in the Northern Zhou Dynasty is rare. The Northern Zhou Dynasty was a short dynasty in the history of China, and the currency circulation time was also limited. In addition, the ancient minted currency is easy to be damaged or lost in the circulation process, so the amount of survival is relatively limited. Although Buquan in the Northern Zhou Dynasty does exist in some museums, private collections and academic research, the overall number is not much.