After looking over a couple of dozen examples close at hand, the grinds on the tangs of 300's vary on several. I am only guessing this is a quick final touchup fix by factory to insure the blade point rests low enough not to be a hazard to hands or pockets.(Common on heavy sharpened blades) On used 300's the blade tip corner of the tang will also show sharpening wear on used knives or those stated to be NIB but may not really be. Electric sharpeners designed for kitchen knives are bad to knock off the tang corner. Crock sticks will do so also, making more of a beveled look to the corner. If it's polished and looks flat I consider it a factory effort in my considerations.