Longines Master Collection 40mm Automatic pairs classic dress-watch design with a blue dial and reliable automatic movement, suitable for formal occasions and daily wear. Key attributes: Blue | Steel | Steel | Water resistant 30 m | Scratch-resistant sapphire crystal | Automatic movement with 64-hour power reserve | Date display | Leather strap with steel clasp | Transparent case back | Blue dial with index hour markers | Round 40 mm polished steel case | Silver-tone hands | Dimensions & fit: Case diameter: 40 mm | Case thickness: 9.5 mm | Composition & care: Steel | Leather | Sapphire crystal | Wipe with a soft cloth; avoid prolonged exposure to water beyond the water-resistance rating; service movement periodically by a qualified watchmaker.