I think this is a " Power of G-D" combong , in other words, something which happened in the forging process.
Is this a " mistake"? Is this an " educated mistake"?
Well, I don't know.
I own one Combong which was revered by his previous Indonesian owner. In my opinion it was made by using a process which would have easily brought the blade to show a cold shut
http://www.vikingsword.com/vb/showthread.php?t=27671
As usual put two people together and you will easily get at least three opinions so I chose to form my own opinions.
