Casio Marine Analogue Quartz Diver "Blue Diver" 44.6mm MRW-230H-2EVDF Blue Dial Resin Strap Men's Watch

The Casio Marine Analogue MRW-230H-2EVDF (popularly known among watch enthusiasts and active tool watch collectors by its series nicknames, the "Blue Diver", "Diver Style", or "Casio Marine") is a bold, high-contrast sports-classic quartz watch. Part of the modern MRW-230H diver series, this 44.6mm timepiece pairs a classic marine-inspired aesthetic with a vibrant blue dial and matching aluminum rotating timer bezel. Designed for active men who appreciate functional aquatic styling, high legibility, and ultra-lightweight durability, it transitions effortlessly from water sports to everyday casual wear.  The defining visual highlight of this MRW-230H reference is its ocean-blue dial face, framed by a bidirectional rotating bezel topped with an anodized blue aluminum timing insert. High-contrast bold geometric hour indices, prominent hands with luminous coating, and an energetic yellow central seconds hand ensure crisp legibility at a glance. Positioned neatly at the 3 o'clock mark is a dual day and date calendar window for daily practical utility.  Beneath its rugged exterior, the watch is driven by a precision Casio electronic quartz movement. Operating with a timekeeping accuracy rating of ±20 seconds per month, this reliable caliber is powered by an SR626SW button-cell battery, delivering approximately 3 years of continuous operation before requiring replacement.  The watch housing measures 44.6mm in width by 47.9mm in lug-to-lug length, featuring a profile thickness of 12.3mm and a featherlight weight of just 39g for all-day wrist comfort. The case is constructed from durable, impact-absorbing black resin paired with a light-catching blue aluminum bezel ring and a tough resin glass lens. Engineered for active performance, the watch incorporates a solid caseback achieving a certified 100-meter (10 bar / 330 ft) water resistance rating, allowing it to perform reliably during swimming, snorkeling, and recreational water activities. The timepiece comes completed on a flexible, dimpled black resin strap equipped with a traditional pin buckle clasp.

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