A lot of watch lovers know that Rolex uses a kind of steel that only the brand uses. Steel comes in different kinds and grades and the majority of steel watches are made from 316L, which is a kind of stainless steel. Modern Rolex in Melbourne is made from 904L stainless steel.
904L steel is not used by others in the watch industry because it is more expensive and more complicated to machine than others. This steel requires special tools and skills, which prevents other brands form taking advantage of it. The use of this metal is one of the reasons Rolex watches are quite expensive.