where was it sold? how many were sold? who produced it? was it mass manufactured? how common were they during the war? was the manufacture of this pen curtailed or was it seen as something that was crucial to the war effort and production ramped up? what is the likelihood of a prisoner of war, in a POW camp, a child no less, being in possession of a ball point pen during the middle of a war that ravaged an entire continent? can you produce evidence that the ball point pen was so widely used at that point in time that a child POW would have one? if she had one, then surely the camp commandant would have one also, not to mention anyone higher up the command chain, people who had access to many things that a POW would not?