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Issuer Japan Emperor Ninkō (1817-1846) Type Standard circulation coin Years 1835-1870 Value 100 Mon = 1/40 Ryō (1/40) Currency Ryō (1601-1867) Composition Bronze (Cast, Cu 78% Pb 12% Sn 10%) Weight 20.7 g Diameter 49 mm Thickness 2.6 mm Shape Oval (With a square hole)
Collection : Japanese yen