Parameters: Model： AM439M Case Diameter： 42mm Lug to Lug Diameter: 48mm Case Thickness： 13.5mm Band Width： 22mm Wearable Length：145~205mm Case Material： Stainless Steel Strap：Silicone Strap Clasp：Pin Buckle Crown：Screw-down Crowns Lens: Sapphire Glass + Inner AR coating Back cover material: Sapphire Glass Movement： MIYOTA 8215 Water proof： 200m (20ATM) Weight： 111g Features: 1.Japan Miyota 8215 automatic movement,accurate, reliable and durable. 2.Self winding and hand winding method.Travel time accuracy (seconds/day): -20～+40 seconds. 3,Sapphire crystal with inner AR coating: anti-glare, high light transmittance, scratch-resistant. 4.Clear date display window for quick reading. 5.Super luminous Hands and hour marker,easy to read underwater and without light. 6.60-min inner rotating bezel,dual fluorescence hands,clear and intuitive. 7.Stainless steel case and silicone strap,comfortable and durable . 8.Exhibition back cover,admire the intricate craftsmanship and mechanical beauty. 9.Screw-down crowns ,200M waterproof,diving performance is even better. Real Pictures