The end of this example is very similar. Beatrice Blackwood does mention during her stay with the Kukukuku, the lack of decoration on all Kukukuku artifacts. Any shape based on a disc, that is swung when the opportunity appears is going to hit the target without any extra thought needed. The small amout of decoration and stone shape does seem to indicate a show piece.
http://webprojects.prm.ox.ac.uk/arms...s/1938.36.411/