Korea
Bank of Hangang Private Ingot of 5 Taels ND AU (Surface Hairlines), KM-X Unl., Mandel-Unl. 59x59mm. 188.23gm. Stamped: "Hanjiang Yin Hang" (Bank of Hangang / Han River). Perhaps very lightly cleaned long ago, though this is hardly detrimental to the overall eye appeal, which is enhanced by a bold strike.
https://coins.ha.com/itm/korea/korea-bank-of-hangang-private-ingot-of-5-taels-nd-au-surface-hairlines-/a/3084-31197.s?type=CoinArchives3084
HID02906262019
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Estimate: 300-500 USD