World Coins - Asia, Middle-East & North Africa VIETNAM: NGUYEN DYNASTY: AR 10 lang (380.97g), with two later added fantasy stamps reading guang xu, and with original edge stamps indicating fineness and hand-engraved incuse marking on bottom, XF. Resembling a hang, or small trough for feeding animals, these long, bowed, rectangular bars called nén bac are a distinctly Vietnamese type of semi-official sycee, which was later produced outside Vietnam as well for use in the opium trade. Today most specimens come to the West via Thailand where they are called Ngern Rong. These bullion bars were made from the early 1800s reportedly through World War II. Cast mainly from Spanish American 8 Reales, Indian Rupees, and French Indochina Piastres, they assay consistently .991 fine. Weights generally range from 370-385 grams with a likely standard of 380. They were made by bankers (silver merchants); when presented to government officials for testing, a fee was paid plus three other "verification stamps" were added.
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