Bulova Marine Star Automatic is a 35 mm stainless steel watch with a blue open‑heart dial and sapphire crystal, designed for everyday wear and water activities up to 100 m. Key attributes: Blue | Silver | Stainless steel | Water resistant to 10 bar (100 m) | Sapphire crystal | 42-hour power reserve | Automatic movement | Deployment clasp with push-buttons | Exhibition case back | Blue dial with open‑heart aperture | Roman numeral hour markers | Luminous hands | Round 35 mm case | Dimensions & fit: Case diameter: 35 mm | Case thickness: 9.7 mm | Composition & care: Stainless steel | Sapphire crystal | Wipe clean with a soft cloth. Avoid contact with chemicals and extreme temperatures. Ensure crown is secured before water exposure. Have movement serviced by an authorized service center.