The Mariner Salt is a great knife. I have had one for about a month and it is quickly becoming a favorite.
The handle is "100% Rust Free Stainless Steel". This is what the catalog and website list it as. I also e-mailed Spyderco directly trying to find out the type of steel it was, but got the same answer from them - "100% Rust Free Stainless Steel". So whatever it is - they ain't saying. I really don't care if the handle is H1 or not. Whatever it is it does not rust, just like the H1 blade its attached to. I have intentionally left it wet, dirty, etc, to see if I could get any rust spots. But so far none at all.