CVSTOS CHALLENGE TOURBILLON SAPPHIRE Cvstos Challenge Tourbillon Sapphire, 41 mm,  Cvstos CVS2600, Manual-winding mechanical,  Openwork tourbillon, Skeletonized, with function:  Hour, minute, seconds, Tourbillon. Reference: (41mm) C00000.0000002 30 Meters / 3 ATM CASE Challenge Sealiner, Tonneau-shaped 53.7 x 41 mm MATERIAL 5N Red Gold, Sapphire COLOR Sapphire CRYSTAL Sapphire with none-reflective coating on both sides CASEBACK Open with sapphire crystal CROWN Screw-down, polished Grade 5 Titanium, rubber insert SCREWS Polished Grade 5 Titanium, exclusive CVSTOS TECHNOLOGY pattern DIAL Sapphire, CVSTOS TECHNOLOGY decoration COLOR 5N Red Gold INDEXES Super-Luminova treated HANDS Pierced, rhodied and Super-Luminova treated MOVEMENT Cvstos CVS2600, Manual-winding mechanical, Openwork