The sheath is the same construction as my vintage Frosts model 54 filet knife.sheath. The lamination line is about 1/8 inch wide all along the edge, which indicates uniform sharpening throughout the length of the edge. There is no secondary bevel. The patina of the harder edge was different from the face of the blade. I could not get it to show up in a photo. After a light sanding with 1500 grit sandpaper of the entire blade the dark line on the edge disappeared, but the rest of the blade did not change, other than the the light rust coming off. That means the surface patina on the hard metal was less embedded. I believe it would return if I didn't sharpen it. Of course, I will have to at least strop it after use. The wire is actually a heavy flat ribbon-like binding that appears to be nickel.