Nike released in 2002-2003 a K-leather version for both the Nike Mercurial Vapor I and Nike Total 90 II. I’m not sure if the boots where a limited release but what I know these are really hard to come by! Some say they were only released in the US or Asia?
Best features on the boots are definitely the black leather and the stiching! You can really see that they are high quality. For me who have always been a big fan of the Mercurial, imagine Vapor in leather! Also I think it was wise to keep the colours simple black/white.