Last year I got a great deal on a set of three Buck knives. One of them was a 105 that I used camping this summer. It kept a good edge and stayed sharp with a little stropping on a piece of leather. As a matter of fact, my wife kept swiping it to use herself. I did cringe when she used it to cut up spuds on a metal plate but she did switch to cutting on a heavy paper plate after that. It is marked in three lines Buck 105 USA. It has one black spacer at the guard and one at the pommel. I was told the blade steel is 425. Is this correct? Assuming that it is, is there much of a performance upgrade if I found one made with 440 and is there an easy way to identify one made with this steel? I really like this knife and I'm glad I already have a spare but wouldn't mind an excuse to buy another!