Maybe it's just the photos but that thing looks huge! I know nothing of that axe type except that its European. Hopefully Jake Pogg, Kevin Houtzager, or Ernest DuBois will chime in as they know WAY more than me.
I think it's just the pictures, its actually not that big. I believe it weighed in around 2.5 lbs and its actually not in that bad of condition. I soaked it in vinegar for a few days to get the rust off