🔹 Overview
The O Speedmaster Moonwatch Professional is the legendary chronograph that made history as the first watch worn on the Moon. This 42 mm stainless steel timepiece preserves the authentic design worn during NASA’s Apollo 11 mission, featuring a hesalite crystal, black step dial, and contrasting white subdials. A brushed and polished steel bracelet ensures both durability and comfort, while its timeless aesthetic continues to inspire explorers and collectors worldwide.

💎 Key Specifications
Case Size: 42 mm
Case Material: Stainless steel
Crystal: Hesalite
Caseback: Solid steel
Dial: Black step dial with white hands and hour markers
Functions: Chronograph, small seconds, 30-minute recorder, 12-hour recorder
Bracelet: Stainless steel with comfort-adjustable clasp
Water Resistance: 50 m / 167 ft

⏱️ Movement
Caliber: O Co-Axial Master Chronometer Calibre 3861, manual winding
Certification: METAS Master Chronometer certified
Power Reserve: ~50 hours
Magnetic Resistance: Up to 15,000 gauss
Frequency: 21,600 vph (3 Hz)
Features: Chronograph function with high precision, hacking seconds

✅ Conclusion
The O Speedmaster Moonwatch Professional Ref# 311.30.42.30.01.006 is more than a timepiece—it is a symbol of humankind’s greatest achievement. With its heritage design, robust calibre 3861 movement, and professional chronograph functions, it bridges history and modern innovation. From the Apollo missions to your wrist, this Moonwatch embodies precision, reliability, and timeless storytelling.