China
Yunnan. Sanchuo Jieding 5 Tael Sycee XF/AU, produced late 19th-early 20th century, three-stamp remittance ingot 144.18g, BMC Class LXVI #918. Stamped three times with the bank name (Leiqingyuan Bank), and twice with the assay mark. Superb, lustrous XF-AU. About as nice as you will see these crudely produced ingots.
Estimate: 1000-1200 USD