The attached pictures show what I thought for years was a 13mm MG 131 case made into a lighter. However a closer examination shows that the case is necked up to 15mm. The case is unfinished in that there are no holes in the primer pocket. The H/s is 15 qls 45. I don’t think post war the Germans making lighters would have necked up 13mm cases to 15mm. My question is, is this an experimental case or just wishful thinking? Thanks in advance for comments.