Stainless steel is not all created equal. The vast majority of watches use what is called 316L steel, and it does its job well. Rolex, on the other hand, famously uses a “special” alloy called “Oystersteel” that they say belongs to the family known as 904L. It takes a polish better and is said to be more resistant to corrosion than 316L, but its hardness makes it more difficult to machine and it requires special processes and equipment to do so. Ball Watch Company’s new Roadmaster Icebreaker watch is one of the very few watches other than Rolex to advertise use of 904L.
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https://gearpatrol.com/2019/08/21/ball-roadmaster-icebreaker-904l-watch/