In France, 16th – 19th century, a unit of mass, about 3.8242264
grams. 
Also called a drachme, and in Burgundy, a treiseau. According to Guilhiermoz,
before the 16th century the same unit was called a tresel in the North and a
ternal in the Midi.
By law between 1800 and 1812, 10 grams.
In the Système Usuel, the gros usuelle was about 3.906 grams, 1/128th of a livre usuelle.
P. Guilhiermoz.
Remarques diverses sur les poids et mesures du moyen age.
Bibliothéque de l'Ecole des Chartres, volume 80 (1919).
Page 10.
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