I just did a google/Image search for "Freikorps" and got hundreds of pics...I saved four showing death's head graphics (trucks, tank, armored car) and all have a 'balloonish' head, which is quite close to the Luger death's heads...
This makes me wonder when we got so spoiled that a proper skull & crossbones had to look like a pirate's flag...Was it during the movies of the 30's??? Errol Flynn as Captain Blood??? Maybe the Freikorps death's heads
were the German embodiment of a skull...