Hold it up to your computer screen and let us get a good look at it.
Seriously, you haven't told us anything to go on.And any answers would be a guess anyway.Having a piece tested is the only way to know what it is.You can do a series of shop tests and get a idea,but unless you can find out the source of the steel,you are merely guessing.Could be D-2,A-2,or any number of other tool steels and stainless steels.