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The chi is a Vietnamese unit of weight. 1 chi weighs 3.75 g. 10 chi (or 1 cay or 1 luong) weighs 37.5 g. Saigon Jewellery and Phu Nhuan (Vietnam) have minted chi gold bars since the early 1990s. PAMP(Switzerland) was the first among accredited manufacturers to produce a range of chi-denominated minted bars for Vietnam, in 1994.