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Copper coin with the characters “建炎通宝” (basic couple coins written in regular script and seal script)
Southern Song Dynasty(1127-1279)
Found in Taiyuan Electrolytic Copper Factory in 1984
The one with regular script characters: 3 cm in diameter; 0.8 cm in aperture; 7 g in weight
The one with seal script characters: 2.9 cm in diameter; 0.8 cm in aperture; 6 g in weight