Not an expert on the Chinese Empire but yours appears to be a Qing (Ch'ing) Dynasty coin. Possibly Emperor Gao Zong who ruled under the reign title Qian Long from 1736 to 1795. The coin would have been cast at the Board of Works mint in Peking (Beijing). It should have a diameter of 26 mm and a weight of 5.3 grams. The top picture appears upside down and the bottom picture should have the mint marks vertical.
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