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It’s a Qing (Ch’ing) Dynasty ‘one cash’ coin of Qianlong (Ch’ien-Lung) Emperor, also known by his posthumous temple name Gaosong (Kao Tsung). This would be the correct orientation of your coin to read the characters:
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He reigned from 1736-1796 and your coin is from the regular series produced between 1736-1795. He abdicated from the throne in 1796 as a mark of respect to avoid reigning longer than his grandfather’s 61 years as Emperor, but retained ultimate power as Retired Emperor until his death in 1799. Like most old Chinese cash coins, imitations were made in later times for use as charms and celebratory gifts, but as far as I can tell, your is original... although not valuable.
The reverse has the Chinese and Manchu characters for “Boo Ciowan” (Pao-Ch'uan), the Board of Revenue mint in Beijing or “the Fountain head of the currency".