That blue dial! The colour comes alive as you move the watch in the light. Very high quality watch in all respects, as always is the case with the Omega Constellations. Caliber 1250 signed 12 jewel movement, numbered 34635857. It also has the signed crystal, crown and inside back cover. Diameter 38 mm, lug to lug 43 mm, thickness 11 mm and lug width 19 mm. It dates from 1972 and represents a very usable vintage. Vintage watch running accurately like a chronometer should, with only the need to change the Renata 344 battery once a year or so.