{"product_id":"casio-g-shock-gravitymaster-gr-b300-1ajf-jdm-master-of-g-aviation-carbon-core-guard-analog-solar-bluetooth-mens-watch","title":"CASIO G-SHOCK GRAVITYMASTER GR-B300-1AJF JDM Master of G Aviation Carbon Core Guard Analog Solar Bluetooth Men's Watch","description":"\u003cp data-source-line=\"11-12\"\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cp data-source-line=\"11-12\"\u003eThe GR-B300-1AJF marks the flagship next-generation MASTER OF G GRAVITYMASTER designed exclusively for aviation professionals facing extreme cockpit and field conditions. Sized 59.0 × 54.7 × 15.7 mm, weighing only 71 g, this timepiece features an innovative Carbon Core Guard structure combining bio-based carbon fiber-reinforced resin case, seamlessly fused with a bio-based urethane band. Aviation-inspired design elements—cockpit-coloration black-and-white with red accent indices, dimensional triple-layer dial, integrated metal bezel accentuating large index marks—deliver intuitive timekeeping legible under extreme lighting. Tough Solar + Bluetooth 4.0 (CASIO WATCHES app integration) enables automatic time synchronization, dual-time display (two time zones simultaneously), flight-log memory for recording current position and time on a mapped route, and smartphone-based world time configuration (300+ cities). A rotary disc indicator at the 9 o'clock position displays battery level, alarm on\/off status, and stopwatch\/timer modes via dual-coil motor. Sapphire crystal with anti-reflective coating, 20 ATM water resistance, and bio-based plastic components emphasize durability and environmental stewardship. Origin: Japan (JDM), Warranty: 1 year, JAN: 4549526373084, Released: May 2024.\u003c\/p\u003e\n\u003cp data-source-line=\"14-14\"\u003e\u003cstrong\u003eKey Specifications\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul data-source-line=\"15-32\"\u003e\n\u003cli data-source-line=\"15-15\"\u003eCase: 59.0 × 54.7 × 15.7 mm; Weight: 71 g\u003c\/li\u003e\n\u003cli data-source-line=\"16-16\"\u003eMaterial: Bio-based carbon-fiber-reinforced resin case \/ bio-based resin bezel \/ stainless-steel\/resin accents\u003c\/li\u003e\n\u003cli data-source-line=\"17-17\"\u003eBand: Bio-based urethane with carbon-fiber insert, adjustable 145–215 mm\u003c\/li\u003e\n\u003cli data-source-line=\"18-18\"\u003eCrystal: Sapphire glass with anti-reflective inside coating\u003c\/li\u003e\n\u003cli data-source-line=\"19-19\"\u003eWater resistance: 20 ATM (200 m)\u003c\/li\u003e\n\u003cli data-source-line=\"20-20\"\u003eMovement: Quartz calibre 5719, Tough Solar\u003c\/li\u003e\n\u003cli data-source-line=\"21-21\"\u003eBattery life: Rechargeable solar (continuous operation in adequate light)\u003c\/li\u003e\n\u003cli data-source-line=\"22-22\"\u003eAccuracy: ±15 s\/month (with Bluetooth sync)\u003c\/li\u003e\n\u003cli data-source-line=\"23-23\"\u003eDisplay: Fully analog dial (no LCD) with dimensional index marks, rotary disc indicator\u003c\/li\u003e\n\u003cli data-source-line=\"24-24\"\u003eFunctions: Dual-time (simultaneous two time zones), world time (300+ cities), flight-log memory (position\/time recording via app), 1\/100-second stopwatch (flyback feature), timer (1-minute units, max 24 hours), 5 alarms, hourly signal, perpetual calendar, 12\/24-hour format, Super Illuminator LED\u003c\/li\u003e\n\u003cli data-source-line=\"25-25\"\u003eConnectivity: Bluetooth 4.0 LE, CASIO WATCHES app (automatic time sync, flight-log, world-time config, phone finder)\u003c\/li\u003e\n\u003cli data-source-line=\"26-26\"\u003eIllumination: LED (white), Super Illuminator, sapphire-enhanced low-light visibility\u003c\/li\u003e\n\u003cli data-source-line=\"27-27\"\u003eSpecial: Carbon Core Guard structure, bio-based materials (eco-friendly), rotary dual-coil indicator, seamless design, titanium button components (in higher-tier variants), TRIPLE G-RESIST\u003c\/li\u003e\n\u003cli data-source-line=\"28-28\"\u003eOrigin: Japan (JDM)\u003c\/li\u003e\n\u003cli data-source-line=\"29-29\"\u003eWarranty: 1 year\u003c\/li\u003e\n\u003cli data-source-line=\"30-30\"\u003eJAN: 4549526373084\u003c\/li\u003e\n\u003cli data-source-line=\"31-32\"\u003eRelease date: May 2024\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-source-line=\"33-34\"\u003e\u003cstrong\u003eKey Highlights\u003c\/strong\u003e: The GR-B300-1AJF redefines aviation-focused G-SHOCK through breakthrough Carbon Core Guard engineering—delivering aircraft-grade shock resistance combined with a featherweight 71 g profile. The analog-only dial with dimensional index marks and cockpit-inspired coloration (black-and-white with red accents) prioritizes instant legibility under intense light and darkness. Bluetooth connectivity via CASIO WATCHES app enables flight-log memory (mapping departure\/arrival coordinates), automatic time synchronization across 300+ global cities, and phone finder functionality—essential for international pilots and remote operations. The rotary disc indicator at 9 o'clock elegantly manages battery-level, alarm, and stopwatch\/timer mode displays through dual-coil motor precision. Bio-based carbon-fiber resin construction and sapphire crystal demonstrate environmental commitment without compromising durability. Super Illuminator LED and anti-reflective sapphire ensure readable timekeeping in cockpit darkness or high-altitude glare. Ideal for professional aviators, military flight crews, expedition leaders, and collectors seeking cutting-edge aviation-inspired design merged with next-generation smart-watch integration in a lightweight tactical package.\u003c\/p\u003e","brand":"CASIO","offers":[{"title":"Default Title","offer_id":47611536834815,"sku":"615072","price":55300.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0720\/0561\/5871\/files\/udetokei-watch_615072_i_20240430185640.jpg?v=1764514500","url":"https:\/\/japanheartfulstore.com\/products\/casio-g-shock-gravitymaster-gr-b300-1ajf-jdm-master-of-g-aviation-carbon-core-guard-analog-solar-bluetooth-mens-watch","provider":"Japan Heartful Store","version":"1.0","type":"link"}