Unknown keris blade, Solo or Madura?

[A. G. Maisey]

This blade is certainly not Solo, but Madura?

I just do not know. It might be, but if so, pretty recent --- it doesn't look recent, however even if we do allow recent Madura, there are more than a few things that are not consistent with that.

I do not want to guess where it originated --- not from a pic anyway.