How about Beijing Gong Bo Zibo Studio?

Gong Bo's rating reputation is very reliable. Gong Bo has three grades. They are American, Top Grade and China. In fact, Gong Bo's coin rating standards are introduced in detail on Gong Bo's website, which are mainly divided into three categories: ancient coins, mechanism coins and paper money. Breaks, cracks, repairs and repairs are not scored, but corresponding comments are given according to the overall effect, such as casting defects, cleanliness and excessive accessories. , or give extra points to those who repair heavy rust as appropriate.