I remember reading a fascinating thread on this forum about the TK logo. There was a picture of a WW1 German officer with a insignia that matches the cartoon logo seen on some of these lugers. He was reportedly in one of the flamethrower units.
Has any WW1 luger ever been seen that is unit marked from one of these German flamethrower outfits,with that same TK logo?
The little marking above the skull does look like a hose of some kind.
That marking is not on the later Nazi TK and the style of the TK seems different.
Just thinking out loud.
Gerben is right, you can believe what you want.
Bob