Rolex Oyster Perpetual Diary 41mm series watch, timeless elegance! Oyster case, waterproof symbol: The diameter of the watch is 41mm, with the same thickness as the original, and the data matches. 1. The classic oyster case is matched with a triangular groove outer ring. 2. The head adopts a screw in design, restoring the double lock double waterproof system. 3. The material of the watch mirror - wear-resistant and scratch resistant sapphire mirror, anti reflective convex magnifying (2.5 times) calendar window. [Strap details] Different watch styles are matched with different steel straps. 1. Commemorative watch strap: Jubilee Bracelet (five bead strap) Material: stainless steel, commemorative type, five row chain links. 2. Oyster watch chain: Oyster Bracelet (three straps). Material: Stainless steel, Head type, semi-circular three row chain links. 3. Buckle type folding buckle, concealed folding crown buckle