The m/43 air combat award silver grade.
The badge was awarded according to a point system, where points were given for achieved results in specific competitions in fighter pilot marksman shooting, air gunner marksman shooting and bomb aiming.
However, these competitions were abolished before the end of WWII, and only about 100 silver badges and 25 gold badges were ever awarded. The badge would supposedly have been awarded for excellent combat skills in "live" air combat action as well, had Sweden been one of the combatants in WWII.