In Spain, a unit of mass = ⅛ once = ¹⁄₁₂₈ libra, about 3.6 grams.
In Mexico, at least as early as the 19th – 20th century, a unit of mass, approximately 3.594 grams (approximately 55.5 grains). From the earlier Spanish unit.
United Nations, 1966.
Galván Riviera, 1844. Excerpt in Spanish with English translation.
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Last revised: 12 May 2009.