similar mace shapes are noted from poland thru the middle east into africa in bronze and stone in pre-history and in wood, iron and steel up to modern times.
i've even seen one made of stone in the aztec/mayan areas of central america.
parallel evolution? form following function? cultural drift? trade? all in all that 'gear' shape and variations makes a wickedly efficient weapon against not only unarmoured but armoured opponents for little expenditure in materials and can be made by relatively unskilled local crafters.
still like freddy's weapon tho. i would have bought it if i''d seen it....
here's an
interesting site on maces