Roman Republic, characterized by a republican style of government, lasted for around 450 years. Starting in 509 BC with the overthrow of the Monarch lasting until around 29 BC at which time began the Roman Imperial period. Exactly when the Imperial period began is a matter of debate. The three most likely candidates: 44 BC with the appointment of Julius Caesar as dictator for life, the battle of Actium and the defeat of Mark Antony in 31 BC or with the granting to Octavian (Augustus) extraordinary powers in the 1st settlement in 27 BC.
Naevia, plebeian family with name Naevia, surname Balbus, Capella ( C. Naevia Balbus ). There are many Roman Repubilic Denarius silver coins of this type with many varieties. The brass coin of these where coined by the moneyers of Augustus. The Roman Republic Denaraius Silver coins of this type are all serrated.