The new Oyster Perpetual series, 277200, size 31m, one-piece middle case, screw-in bottom cover and winding crown; screw-in structure double buckle lock dual waterproof system, screwed to the case, making it more waterproof. Made of sapphire Anti-scratch blue crystal. Each color of the dial can be adjusted one by one to achieve zero color difference. Polished nails, top Swiss super ice blue luminous, delicate shading, color matching; with imported movement, its performance is particularly outstanding,