Rolex early and other brands using the swiss replica watches same steel -316L steel, but in 2003 or so, all steel products are beginning to replica watches use 904L steel. In 1985, Rolex in the Sea-Dweller's minority version of the first use of rolex replica watches 904L steel, more rust, corrosion resistance, but at the same time 904L steel has a drawback, that is, with the increase in steel hardness