wow. gorgeous axe. i'm jealous. i agree with the european personal weapon analysis. the belt clip screams maritime.
only the officers on naval vessels were allowed personal weapons beyond their utility knives, tho of course that did not apply to merchies, privateers and pirates. they were normally just issued as part of the 'beat to quarters'. for those who wonder what that was: a drummer would beat out the rhythm that signaled general quarters - all hands man your battle stations
https://www.youtube.com/watch?v=n9tmPVvi7uo (less the cymbals tho)
most boarding axes were fairly long, and while they were certainly used as weapons, they were mostly for clearing & cutting away rigging and breaching doors/barricades, etc. and were a bit cumbersome. you'd likely lose against a sword or pike. this one looks light and very deadly.