I always assumed they are gold coated, the first chance I get into a reliable mental/physical state going to open up a (2) and (10) numbered cases to check, hoping the color behind the bezel will support one of the theories until actually getting them xrayed
Thanks for the 168.008 reminder, I've also seen a couple of regular gold coated cases look like the dual color solid 168.008 case, I always assumed they are what happens when the bezel is polished, that's why I think they are simply coated cases, as the color of coated bezels always match the case too
Some sellers advertise CD 168.029's as having 18K bezels for example, that one in my opinion is very unrealistic as the coating itself should be 14K - once again, all assumptions at this point until tested
I've also heard of other rare cases, but never actually saw one, I wouldn't be surprised if there's an 14K WG case etc. out there too
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