Convert from onca [Portuguese] to drachme

Unit Definition (onca [Portuguese])
The onça, once, oncia, onza is traditional names for the ounce unit in Romance languages. The Portuguese onça and Spanish onza equal 1/16 libra or about 28.69 grams (1.012 ounce).

Unit Definition (drachme)
The drachme is a traditional unit of weight in France and Germany, generally between 3.7 and 3.9 grams.