S90V is a steel that eats sharpening stones, and mirror DLC is a finish that shows every fingerprint. The Kansept Contra K1139A5 combines both on a 3.25-inch blade with a purple anodized, diamond-patterned titanium handle for $233.89.
The numbers: 3.25-inch blade in CPM S90V with a mirror DLC coating, thumb stud deployment, purple anodized titanium handle with a diamond texture pattern, symmetrical frame, titanium clip. The design credit is Nathan's — the Contra name comes from the designer rather than from the shape.
S90V is a high-vanadium stainless from Crucible with the highest wear resistance of any steel in mainstream production use. It will hold a working edge through months of cardboard where S35VN gives up in weeks, and it will also take three times as long to sharpen and demand diamond abrasives. The mirror DLC is not decoration either: it lowers friction at the cut, hides the scratches that a satin finish collects, and protects a steel that is more corrosion resistant than D2 but less than MagnaCut.
The lockup itself is a frame lock with a steel insert, which is the arrangement you want on a knife with a S90V blade: a titanium-on-steel interface would gall long before the edge gave out. The diamond texture on the handle is the ergonomic argument. Anodized titanium on its own is slick; a machined diamond pattern gives the thumb and palm something to register against without the abrasiveness of G10. That is the sort of detail that separates a $233 knife from a $90 one, along with the symmetry — this is a frame lock with matching show-side geometry rather than a slab with a pocket clip bolted on.
Verdict: a collector's user, which is a real category. Buy it if you want maximum edge retention and an anodized finish that will not wear through in a month. Skip it if you sharpen on anything other than diamonds, because S90V at production hardness will ruin a ceramic rod and frustrate you for an hour.