Random thoughts.... looks like it was meant to go in that pouch - so it's most likely Swiss in origin, looks like a black phosphate finish and marked with part numbers and no manufacturer's name - that makes me think it's military or at least government service (possibly fire or rescue), the pouch is leather, not nylon - so it's got some age on it. My first thought was maybe some sort of crash rescue tool, but it seems awfully small for that. Small for a hydrant wrench too, for that matter. So my guess would be some sort of armorer or gunner's combination tool. There's lots of pictures out there of combination tools used with various mortars and heavy weapons, but I couldn't find one that looked like this. But if it's Swiss - being a neutral nation, there isn't the amount of interest in or information about their equipment out there that there is for more belligerent nations. Just my thoughts.