Limited production of 200 pieces Exterior Exterior: 18K yellow gold Case BackSee-through and ample, screw case back Glass material: Box-shaped sapphire crystal Glass coating: anti-reflective coating on inner surface Case SizeDiameter 38.8mm, 43.7mm from lug to lug, 10.4mm thick Band width: 19mm Band material: crocodile leather Movement Caliber number: 9SA4 Indication Movement type: Manual-winding Power reserve: approx. 80 hours Average daily deviation: +5 to -3 seconds per day Average daily deviation is the average of the daily differences when the movement, before being assembled into the case, is measured at a constant rate in 6 positions for 12 days in an artificially controlled environment. Normal operating accuracy: +8 to -1 second per day Features Waterproof Splashproof Magnetic resistance 4,800 a/m Other details/features 18K yellow gold crown Limited edition on case back Serial number engraved on case back Power reserve indicator