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Rolex

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Not sure, I've not seen the particular watch in person, but judging by the gold tone in pictures and typical basic requirements of a watch case , I'd say it's most likely be the CuAl10Fe3.

Al content is 8.5%-11% , this particular alloy can offer good strength/hardness , good resistance to corrosion (for a copper alloy) and a good color balance between luxurious gold/brass tone and vintage copper/bronze tone.

IMO it's still more of a novelty material in general, when it comes to salt water corrosion resistance , low carbon high chromium based stainless steel alloy such as 904L and H1 (a true SS) will still outperform pretty much all other watch case materials except ceramics. But sadly even the most cutting edge flexi-ceramic (which will chip instead of shattering) is still too brittle to be used on a tool watch that's going to get knocked about a lot.




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