Yep, that is a beautiful broad axe. First you fell the tree, then you buck to length, then you hew notches every foot or so to the chalk-lines for your beam, then you split the wood between the notches (everything to this point is probably using the same felling axe), finally, you follow up with a broadaxe to bring everything into the same plane. It might not look like it, but it is a finesse tool.
I'm guessing it's a left hand axe, and whomever needed a right hand axe so improvised and flipped the head over and installed handle from topside, and ouila! a right hand axe though a tad funky. An improvisation that looks a tad unorthodox but works good enough. The curve of the handle looks wrong too. Gives it added character and history.