The Omega Constellation reference 131.25.29.20.55.002 features a 29mm case crafted from stainless steel and yellow gold. It is powered by the automatic winding Omega caliber 8700, which includes a co-axial escapement for enhanced precision. The watch showcases a white mother of pearl dial and includes a date function. This model was produced in 2018 and is classified as a chronometer, ensuring its accuracy and reliability.