Gorgeous piece, but I would agree with the others that this isn't a boarding ax per say. Of course, in the early periods of sail, ANY ax that went to sea could be contrived as a 'boarding ax'. The era of the classic boarding pieces started in the 1600's and were indeed patterned after the spiked, double bearded battle axes. The next 'pattern' to be seen were the fur trade axes coming over to the Americas in the 18th c. This piece being so early probably excludes it from maritime use. Still, the lanyard ring and belt hook throw me, as I've never seen early hunting axes with them.