Read more 316L stainless steel bracelet with push button butterfly clasp The main part is matte, and only the thick part is polished for an elaborate finish. The deep texture plays a role in the luxurious texture. FEATURES Case Width: 40 mm Crystal: Sapphire Crystal Scratch Resistant Material: Stainless Steel Crown: Screw-Down Crown Type: Cal. A4610 Automatic mechanical movement Case Depth: 10mm Band Color: Black/Brown Band Width: 21.5 mm Clasp: leather-single-locking-fold-over-clasp Special Features：Calendar/Day Water Resistance: 50m（5ATM） Power Reserve: 80 Hours Weight：88g Read more 40mmSwarovski crystal diamonds Dial Platinum-plated steel hands， 4 o'clock dial position shows the date, Super-LumiNova Luminous Material, A Powerful Luminous Material That Can Be Recycled Using No Fear Of The Night. 30mm Transparent caseback self-produced auto machanical movt Cal. A4610,80 hours power reserve, Double way winding system,Incabloc triangle shock absorber, vibration frequency 4HZ(28800 v.p.h),Equipped with 27 Jewels, Blue steel screw as ornament, Used high-grade circular Geneva pattern polished and carefully crafted. 316L Stainless Steel Case&The Sapphire Glass In The Planning, Design, Precision Machining & productionOf The 193 Processl, lt Gradually Came To Life, Through 32 Hours Of Processing Carving,It Eventually Condensed Into 34g Thin Case On Your WristThickness Only 11mm(0.43inch). Read more How to maintain this mechanical watch? When using for the first time, please manually wind up the watch to get enough energy to keep it working well, energy dial shouldn’t exceed 35. If you wear the watch less than 8 hours a day, please manually wind up your watch to keep working well. Please avoid wearing it in hot water or under thermal steam environment, such as hot bathing, hot springs, sauna, etc. Battery free, as you wear it, it will automatically continue to wind up. If you wear it more than 10 hours a day, you won’t never to manually wind up your watch. Read more Tourbillon Bosch Big Bang Schwarzwald Moon phase Baikal Case Diameter 40mm 40mm 44mm 41.5mm 40mm 40mm Strap Diameter 20mm 20mm 24mm 25mm 20mm 21.5mm Mirror Material Sapphire Crystal Sapphire Crystal Sapphire Crystal Sapphire Crystal Sapphire Crystal Sapphire Crystal Movement Cal. A9001 Manual machinery Cal.A4710 Mechanical self-wind Cal.A5500 Mechanical self-wind Cal.A4910 Mechanical self-wind Cal.A4610-2 Mechanical self-wind Cal.A4610 Mechanical self-wind Water Resistant 5ATM 5ATM 5ATM 5ATM 5ATM 5ATM Features skeleton,Tourbillon,Double way winding system energy reserve, skeleton,waterproo 24 hours display, luminous energy reserve, luminous,skeleton waterproof, Moon phase,80 hours display energy reserve, calendar,luminous