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| | Perspectives in Numismatics - Eight Hundred Years of Roman Coinage |
 | | But during the period of the cast aes grave coinage, extending down to about 212 B.C., no such development took place and the pieces are all anonymous. |
 | | The initial issue of aes grave coins from the mint of Rome comprised a series of seven denominations, ranging from the basic unit of the as, weighing about 322 grams, to its twentyfourth, the semuncia. |
 | | A youthful Janiform head, perhaps representing the Dioscuri, appears on the obverse of the earliest as, whilst the reverse shows Mercury wearing his winged petasus. |
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