The reference number 304.30.44.52.01 belongs to the OMEGA Speedmaster Racing Co-Axial Master Chronometer Chronograph 44.25 mm . The detailed description provides a perfect overview of the offer. General characteristics: Model : OMEGA Speedmaster Racing Co-Axial Master Chronometer Chronograph 44.25 mm Reference number : 304.30.44.52.01 Collection : Speedmaster Case diameter : 44.25 mm Material : stainless steel Glass : Scratch-resistant, anti-reflective sapphire crystal on both sides Water resistance : 5 bar (50 meters / 167 feet) Dial: Color : Black Design : Racing style with striking minute ring and classic OMEGA Speedmaster details. Details : The dial has a domed profile and displays chronograph functions with a central seconds hand and sub-dials for 30 minutes and 12 hours. Clockwork: Caliber : OMEGA Caliber 9900 Type : Automatic chronograph movement with Co-Axial escapement, certified as Master Chronometer. Power reserve : 60 hours Special features : The movement is resistant to magnetic fields up to 15,000 Gauss and has been tested and certified by METAS (Swiss Federal Institute of Metrology). Bracelet: Material : stainless steel Closure : folding clasp Special features: Chronograph function : 12-hour and 30-minute counter Tachymeter : On the bezel Date : Small window at the 6 o'clock position Transparent case back : Sapphire crystal back that makes the movement visible. Conclusion: This watch combines the legendary Speedmaster DNA with modern technical innovations. It is particularly suitable for lovers of chronographs and motorsport designs, thanks to its racing aesthetic and the precision of a Master Chronometer. We provide you with a 1-year warranty on the movement.