Just got these two daggers, I believe arm daggers, apparently acquired in Gambia during WW2.
The smaller has a 7'' blade and is 11'' overall. The larger (7 3/4'' blade, 12 3/4'' overall),is much more interesting, the blade is hand forged and sharpened on both edges, the point is unusually shaped and very sharp. The embossed design on the blade (both sides) suggests the symbolism of a snake, The sheath fits the blade perfectly and I believe it is the original, so I think the dagger was made with this uncharacteristic point. Not certain whether this knife's point was designed for a similar effect/useage as the dagger Tim posted,
http://www.vikingsword.com/vb/showthread.php?t=2081