Sorry Puff, but i just don't see it. The only similarities here are in the hilts and even those have many subtle differences. The blades are very different dapurs and the sheaths are also very different styles and also lacks the bands. Is the hilt the only thing that determines the identity of this keris as coteng? How can you ID this keris as Sonkla-Nakor when it is so structurally different from the examples you present?