Thanks for uploading the clearer picture of the fret works, mykeris.
looking at the blade as whole, I think it is out of proportion, especially at the sorsoran..... it doesnt widen harmoniously as a keris blade (dapur pandai saras) should be...... since this blade is quite old and dressed in Tajong hulu and sheath, I dont think it's due to the empu's inadequacy - rather, my theory is, somebody may have fiddled the blade to look good (some times to fetch a higher price).... But of course, I am not too sure about this