The Omega Speedmaster reference 311.98.44.51.51.001 features a 44mm black ceramic case and is powered by the automatic winding Omega caliber 9300. Introduced in 2015, this model includes a chronograph function, date display, and is certified as a chronometer. It also incorporates a co-axial escapement, enhancing its precision and reliability. The watch's design and functionality make it a notable addition to any collection.