As far as I know the Spyderco/Walker collabirations were called "Walker".
There was a carbon fiber made by Klotski(sp?) in Switzerland, and the Almite and FRN versions by Seki.
I have never heard of a knife by that name beeing sold by Spyderco.(That doesn't mean that there wasn't, just that I don't know about it)
It may be a Klotski model, IIRC they have done a couple of Walker designs.
Hope this helped some,
Bruceter