Based on your description, your knife is an assisted opening knife with the ability of being able to turn off the assist feature (it's not an "auto" type knife). Kershaw made two different models with this feature, the Cyclone and the Mini Cyclone with the only difference be the size. The Cyclone models came with either a drop point style blade or a tanto blade...obviously your's had a tanto blade. Here is a picture of a Kershaw Cyclone. I hope this helps you and others in getting your knife back.
Also, I believe this thread shouldn't be in the classified section. You will get more exposure in the Cutting Edge section and the Break Room.