That's a great question! I've never seen any personally, but I remember from my pocket knife days that a lot of custom makers (and some workshop warriors) were "heat anodizing" titanium knife scales. Can't be any different with a watch case/bracelet.
Only one. It looked super kick ass cool and was made by a company called MCCARTHY TIME INSTRUMENTS. I do not know if the company is still active or if the watch went into production. This image is from their blog which has more pictures and information.
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