Omega Constellation Co-Axial Master Chronometer Watch - 38 mm Steel And Yellow Gold Case - White -Silvery Dial - Brushed Steel Bracelet - 123.20.38.21.02.006 Thin octagonal crown with a blue

octagonal crown with a blue sapphire

convex sapphire crystal with antireflective coating on both sides

merging seamlessly with the bracelet

embraces the scratch-resistant sapphire crystal guarding a captivating black dial adorned with refined index hour markers

Omega Constellation Co-Axial Master Chronometer Watch - 38 mm Steel And Yellow Gold Case - White -Silvery Dial - Brushed Steel Bracelet - 123.20.38.21.02.006 Thin octagonal crown with a blue38 mm stainless steel and 18K yellow gold case, transparent back, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, white opaline silvery dial with silk like, caliber 8500 self winding Co Axial master chronometer movement with date function, approximately 60 hours of power reserve, brushed stainless steel bracelet with polished 18K yellow gold bars. Water resistant to 100 m (330 ft).