From what has been discussed on the forum, Mr YODA would be correct to assume #6. But, he is, in fact, wrong. Why? Because not everything has been published.
This knife was in my studio (also known as the garage) getting photographed in preparation to go up for sale. So, I won't steal the owner's thunder by discussing details about it but rather just tell you that you'll find out more in the coming week or two.
Sorry, but it's not my knife and I probably shouldn't even have shown the picture. But, it's such a cool picture with the defraction and all that I really wanted to show it.