🔹 Overview
The O Seamaster Diver 300M Chronograph Ref. 210.30.44.51.06.001 is born from the deep and built to conquer. Since its debut in 1993, the Diver 300M has earned a reputation for technical innovation and ocean-ready durability. This 44 mm chronograph version amplifies the legacy with commanding presence, a refined wave-pattern dial, and unmatched diving performance — embodying precision, strength, and modern elegance.

💎 Key Specifications
Reference: 210.30.44.51.06.001
Case: 44 mm stainless steel
Bezel: Polished blue ceramic with white enamel diving scale, unidirectional
Dial: Sun-brushed PVD chrome dial with laser-engraved wave pattern, two blue chronograph subdials
Indexes & Hands: Rhodium-plated, filled with white Super-LumiNova, skeletonized hands for legibility
Crystal: Scratch-resistant sapphire with anti-reflective treatment
Bracelet & Clasp: Stainless steel bracelet with extendable foldover rack-and-pusher clasp and micro-adjustment
Chronograph Functions: Small seconds at 9 o’clock, 12-hour + 60-minute totalizer at 3 o’clock
Water Resistance: 300 m / 1000 ft, screw-in crown, helium escape valve

⏱️ Movement
Type: Perpetual, mechanical, self-winding
Caliber: O Co-Axial Master Chronometer Calibre 9900
Certification: METAS Master Chronometer, resistant to magnetic fields up to 15,000 gauss
Features: Column wheel and vertical clutch for smooth chronograph operation, central hours, minutes, chronograph seconds, date at 6 o’clock
Power Reserve: ~60 hours via twin-barrel system
Finishing: Geneva waves in arabesque, blackened screws, fine decoration visible through sapphire caseback

✅ Conclusion
The O Seamaster Diver 300M Chronograph Ref. 210.30.44.51.06.001 is the ultimate fusion of technical performance and deep-water style. Its stainless steel construction, blue ceramic elements, and wave-motif dial create an iconic maritime aesthetic, while the advanced Calibre 9900 ensures unmatched precision and reliability. Whether for professional diving or adventurous everyday wear, this timepiece is a bold statement of O’s mastery in ocean-inspired watchmaking.