Bell Ross Experimental BR X-2 Tourbillon Series MOVEMENT:  Asia Manual Wind Tourbillon Movement Decorated to BR-CAL.380 Movement CASE DIAMETER:  42.5mm X 42.5mm THICKNESS:  12.5mm  DIAL COLOR:  Skeletonal Dial with Stick Markers (Swiss Grade Superlume Applied) CASE MATERIAL:  Solid 316L Stainless Steel BRACELET:  Grey Croc Embossed Print Calf Leather Strap with Insignia Buckle FRONT GLASS:  Sapphire with Light AR Coating (Swiss Grade) - Sapphire Front Bezel BACK GLASS:  Solid Sapphire Case Back with detailed Engraving  CLASP TYPE:  Normal Tang Buckle DATE INDICATOR:   OTHER REMARKS: Waterproof to 30m direct from Factory