CHINA. Yunnan Sanchuo Bianding. Provincial Three-Step Slab Ingots. 5.5 Tael Bank Ingot, ND.209.04 gms. BMC-Class-LXVIII, group C. "Tong Sheng Zi Hao" (Tongsheng Bank). Two test cuts in base.VERY FINE.Ex: Irving Goodman Collection, Superior Sale, June 1991, Lot #2063.