Here is a vulgar but "honorable" gesture of defiance in the face of the barbarism of our time, obviously it is not an oath pose but without a doubt if our good gentleman with his hand on his chest from the Golden Age raised his head he would certainly raise his middle finger with a clenched fist.
Formerly the use of the comb simulated and was linked to the male phallus and its magical power to ward off the evil eye, a kind of phallic amulet against curses.
However, its practice as an obscene gesture comes from Roman times when Caligula offered his hand to his effeminate tribune to be kissed, the delirious and depraved emperor threw his finger in that position to humiliate his subjects.
As a direct insult we must go back to the Hundred Years War that faced the kingdoms of England and France when the French cut off the middle finger of all British archers, who, demoralized, were prevented from using their powerful bow. As the war favored the English, they showed them their middle finger to challenge and mock them.
We leave it to your imagination who to direct such an effective and ancient posture ...