Added pics and specs to CS-53HS Cold Steel Tokyo Spike
The Spike, designed by Barry Dawson, is a weapon pared down to its bare essentials. Its thick, narrow blade is distal tapered and flat ground to a zero edge. This creates a unique cross section that facilitates both penetration of the tip and cutting power previously unknown in such a thick, narrow blade. Traditional Japanese Spiked Tanto shape with false edge on spine.
More information here:
http://www.1sks.com/store/cold-steel-53hs-tokyo-spike.html