The uncia ("twelfth part") was a Roman denomination worth 1/12 of an as.
Obverse types of the uncia include a knucklebone (c. 289–245 BC), a barleycorn (c. 280–245 BC), and the helmeted bust of Roma (from c. 240 BC).
In imperial times the uncia was briefly revived under Trajan (98–117) and Hadrian (117–138). This coin was about 11–14 mm in diameter and weighed about 0.8–1.2 grams. It featured the bust of the emperor on the obverse with no inscription and "SC" (for Senatu Consulto) in a wreath on the reverse.
Obverse types of the uncia include a knucklebone (c. 289–245 BC), a barleycorn (c. 280–245 BC), and the helmeted bust of Roma (from c. 240 BC).
In imperial times the uncia was briefly revived under Trajan (98–117) and Hadrian (117–138). This coin was about 11–14 mm in diameter and weighed about 0.8–1.2 grams. It featured the bust of the emperor on the obverse with no inscription and "SC" (for Senatu Consulto) in a wreath on the reverse.
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