The GC Sport, tested and approved by some of the world's most successful professional athletes, is an elegant, high-performance sports watch based on the inimitable Maestro. The watch's 39mm case is cast in polished Grade 5 titanium, a material that's as hard as steel, but 40 per cent lighter. It is indeed a lightweight watch, with an overall 50 gr ca, and 8mm of thickness. To guarantee comfort in the movement and prevent rubbing during play, the watch's screw-down crown has moved from the right to the left side of the case.