In the silver NewStyle there are three representations of these two and I have all three! Two are represented by their caps with stars above and one by a representation of the twins standing in for the brothers who are the first and second magistrate of this coinage. Athens New Style tetradrachm c 154/3 BC Obs : Athena Parthenos right in tri-form helmet 34.5mm 16.72g Thompson issue 11 Thompson catalogue : Obs 60 : Rev (not in plates)/ NEW? Rev : ΑΘΕ ethnic Owl standing on overturned panathenaic amphora 2 complex magistrates monograms in both fields RF symbol : Caps of Dioscuri All within a surrounding olive wreath Athens New Style tetradrachm c 123/2 BC Obs : Athena Parthenos right in tri-form helmet 16.23g 30mm Thompson issue (new) 42 Thompson catalogue: 479g REV : ΑΘΕ ethnic Owl standing on overturned panathenaic amphora on which month mark Δ control ΣΦ below 3 magistrates : MIKION EURYKLEI BOYKATTHES RF symbol : Dioscuri All surrounded by an olive wreath This is typical coin from the "over-represented" group of 4 coins as found in Thracian coin hoards. Lots of NewStyles from the mid 120's BC ended up in Thrace,probably to bribe or pay mercenary soldiers on behest of the Romans. These circulated well and when eventually hoarded are most often found like my example, well worn and often mixed with imitative Thasos tetradrachms. Athens New Style Tetradrachm c 99/8 BC Obs: Athena Parthenos right in tri-form helmet 15.43g 29mm Thompson issue 66 Thompson catalogue: Obs 901: Rev NEW REV: ΑΘΕ ethnic Owl standing on overturned panathenaic amphora on which month mark H? control ΣΟ/MH below 3 magistrates : DEMETRIOS AGATHIPPOS OLY RF symbol : Caps of Pilloi All surrounded by an olive wreath This is the largest known NewStyle issue of 47 obverse dies, depending on whose low chronology sequence you follow it can be dated normally to be 99/98/97 BC. It has been mooted that it might be connected to a slave revolt c 100 BC, we don't know. There is fulminating Zeus ae with the caps of the pilloi symbol featured and it is often thus to be date related.
I was not into Ancients until recently. I do not buy coins, but you and others are tempting me by the photos you post. Love the coins!