Description: Omega Constellation Pre-owned Omega Constellation ref 123.20.31.20.05.001 (2015) belongs to one of the most important collections in Omega’s history. The Constellation dates back to 1952 and was originally created to showcase the brand’s most precise chronometer-rated movements. For decades, these watches represented Omega at its technical best, and the name “Constellation” itself references the observatory trials where the brand set numerous