Oh Boy,
This is one of my favorite Spyderco subjects. I have always loved Spyderco products. Dex, (Dexter Ewing), and I, have put more 440V Spyderco Military's into forum members pockets, than could be counted, (hey Sal, where's our reward?). In fact, we put them ON THE MAP! (Check out the archives for proof!).
Anyway, one of the most unusual, (and in my estimation), QUALITY Spyderco knives I have ever encountered was the large and small "Divers' Probes". I first came across my first Dive Probe, (a large), about three years ago in a pawn shop. I noticed the Spyderco logo on this serrated blade, with a line cutter, connected to this huge hunk of steel, (with metric and standard measurements), that ended in a prybar! I asked the clerk if he knew what is was and he answered he didn't.
Growing up in Southern California in the fifties and sixties, I used to pry abalone off the rocks on the Dana Point cliffs, (in low tide), and dive for them in shallow water, (man, was THAT a long time ago!). So I guessed it was an abolone knife.
The weight, (and again), the quality of this thing, overwhelmed me! I immediately bought it. When I got home I E-mailed Spyderco and a Mr. Patrick Kelly, (a TRUE gentleman, and thanks Patrick), informed me that I was correct, that the big hunk of steel in my hand WAS an abalone knife, or as Syderco called it; "A large Diver's Probe".
Being a "Stupid Ass", I later sold it, (albeit at a profit), on the old KnifeForums. I have missed it ever since. I have since aquired a small Probe and agree with Sal that it is much handier but cannot compare with the "shock power" of the large.
This is one of the reasons I love Spyderco stuff...such diversity and such QUALITY!