For many years now, watchmakers on all levels have tried to separate themselves from the pack by experimenting with different watch case materials. Nowadays, we're used to seeing some highly impressive materials make their way onto our wrists. Ceramics, plastics and carbons are all enjoying their day in the sun, but how do the older, more traditional metals stack up against one another? Here's a quick guide to the most popular metal cases on the market today. Stainless steel Stainless steel is a common, highly resistant, easy-to-machine alloy that comes in a few types. The most common (by far) is 316L stainless steel. This is hypoallergenic, surgical grade steel that is favoured by many manufacturers for its ease of use and affordability. Although 904L steel (the kind used by Rolex) has the potential to be more resistant to corrosion and to hold a high polish better, the margin for error in the performance of these two types of steel actually overlaps, so in practical terms, while 904L is generally regarded as superior, the difference is minimal (and could theoretically be non-existent).   Bronze Bronze is far from a traditional material for watch cases but is currently very much in vogue.…

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