STRANGE AXE HEAD

[Royston]

This belongs to an old friend of mine.
Any ideas as to what it is. It came from ebay and when he bought it it he thought it was a boarding axe, but when received it appears too big. it has a very chisled blade which looks more like a log splitter to me but I cannot explain the spike.
It has some sort of mark but it is not clear at all.

All suggestions are welcome

thanks
Roy