Just an idea concerning the notch. The other day, I saw a fixed-blade Bear Grylls Gerber (it was a special edition survival knife) that had a very similar notch. It was unfinished inside the notch though, and light reflected off of it. Apparently, the idea was it can be used to signal a search plane/helicopter, in the event you become lost in the wilderness.
I know... it may seem like a lot more of a novelty than anything else, but I thought the idea itself was clever, at least. And in the remote chance that you do get lost in the wild, I suppose it could help.
What do you think? Novelty, or good idea?