Thanks for the comment,
the photo from Rasjid shows similar circles, and it seems that everything is possible, and I see it now as a form of artistic design.
I know that it is not everyone type of keris.

but it works for me.
Perhaps I can always use it to hypnotize someone with it
One of the reasons I bought him was that the carving was from a good quality and it cames whith a nice hardwood keris board that goes with it.
i believe that the keris of Madura is often a real work of art, but sometimes with olmost exaggerated decorations including the woodcarving.