My first impression is that of Pallas Athena.
Though I still cannot link to a revenue stamps.
A slight connection to Mars, as Pallas Athena was the goddess of war.
Since the Renaissance, Athena has become an international symbol of wisdom, the arts, and classical learning. Western artists and allegorists have often used Athena as a symbol of freedom and democracy.
ATHENE (Athena) was the Olympian goddess of wisdom and good counsel, war, the defence of towns, heroic endeavour, weaving, pottery and various other crafts. She was depicted as a stately woman armed with a shield and spear, and wearing a long robe, crested helm, and the famed aigis--a snake-trimmed cape adorned with the monstrous visage of the Gorgon Medousa (Medusa).
Young woman with Spear Shield
Defining icon maybe her long blouse, with what looks like a neck trimming of the Gorgon Medousa (Medusa).