Oh now this is interesting
A special very limited edition Chanel J12 for the twentieth anniversary of the model
First watch ever made with a full sapphire bracelet
Also the case is sapphire, the dial is sapphire, and the base plate and main bridges of the movement are sapphire
Sapphire is the second hardest mineral in existence, is quite brittle, and quite enjoys splintering so machining this thing was clearly a complete pain in the arse