Quote:
Originally Posted by SRG89
Off the top of my head there’s the blue openworked code tourbillon, not sure if it’s the same finishing though
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Quote:
Originally Posted by edo
Concept and Code Tourbillon used it. ALD (Atomic Layer Deposition) process is what AP calls it...
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Thanks for pulling these up, and interesting to know it's ALD. At first I thought it may have been heat-treated like a blued screw.