Can't add much other than it seems like there were about 100 made. I have #81. I think there were supposed to more made when ZT was able to, but it's been quite a while so who knows.
I can't remember how long ago it was, but it couldn't have been more than two years ago when they came out.
If you haven't noticed it yet there's a carbide tip on the end for breaking glass.
The blade shape makes deployment really fast doesn't it ?
Hope you enjoy it.