Fanmis Waterproof Calendar Automatic Mechanical Watch Diamond Stainless Steel Men's Watches White 316L stainless steel , the best stainless steel The mirror on the watch is made of Synthetic-sapphire glass , making it look clear and transparent The date is clearly displayed in a mini window. Just throw a glance at the dial, you will get the calendar easily. 30m water resistance, protects your watch from splash and rain, convenient for your daily life, not suitable for swimming and sauna, etc. We have first-class after-sales service, please rest assured purchase, please contact us immediately if there is any quality problem, We will reply you within 24hours ,and provide a satisfactory solution. 12-Month Warranty Service and one Month Return Policy.