When Powder Is Harder Than Steel: Roger Dubuis Excalibur Quatuor Cobalt MicroMelt
The mere existence of the Roger Dubuis Excalibur Quatuor is incredible, and the Excalibur Quatuor Cobalt MicroMelt reignites earlier amazement over such a complicated piece with a new process and material for the case that would make a nerdy metallurgist stand up and take notice.