Uncia (coin)
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The uncia (Latin; Template:Literally) was a Roman currency worth one twelfth of an as.
Republican coin
By derivation, it was also the name of a bronze coin valued at Template:Frac of an as made during the Roman Republic.<ref>Template:Aut, A Manual of Roman Coins: from the earliest period to the extinction of the empire, W. H. Johnston, 1865, p. 7. Available online.</ref> The uncia started as a Roman-Oscan weight of 22.75 grams for a 273-gram pound (libra), with Attic weight issues of about 27 grams under the libral standard for a 327 gram pound and was produced occasionally towards the beginning of Roman cast bronze coinage. Obverse types of the uncia include a knucklebone (Template:Circa BC), a barleycorn (Template:Circa BC), and the helmeted bust of Roma (from Template:Circa).
Empire coin
In imperial times the uncia was briefly revived under Trajan (98–117) and Hadrian (117–138). This coin was about Template:Convert in diameter and weighed about Template:Convert. It featured the bust of the emperor on the obverse with no inscription and "SC" (for Senatu Consulto) in a wreath on the reverse. If this issue belonged to the imperial system, meaning it was not a provincial piece, it would be an uncia. This issue may have been made only for circulation in the East.Template:Citation needed