Mandau with some unusual motifs

[VVV]

Thanks all for your additional comments.
I haven't either seen the snake biting it's own tail in Borneo or Malay symbolism.
On the amount of circles I first suspected that the circle motif was a more potent (= complex or hidden if you follow the principles of seals and magic theories) variation of the seal of Solomon as seen above the rings in my example. My other Moro kris has 8 rings which corresponds to the 8 rings in the seal. The problem is that my "new" kris (the one on the picture enclosed above) only has 6.
Maurice, with your ex-mandau we now have 2 of those. based on the 100's of mandau we have in our networks collections as well as the museum databases that still is quite rare. BUT a collector friend of mine (A) told me that maybe it comes from other utensils like the enclosed example from Hose & McDougall Vol 1, p. 229? Unfortunately there is no explanation to it and in the other books of Borneo motifs, like A.R. Hein, I don't find it.

Michael