Omega Diver 300m Co-Axial Master Chronometer 42mm 2019 [Preowned]Overview When Omega relaunched the Seamaster Diver 300M in 2018, the headline change was the movement: Calibre 8800, Co Axial Master Chronometer, METAS certified to 0 +5 seconds per day, and magnetic resistance rated to 15,000 gauss. The 210. 30. 42. 20. 06. 001 is the 42mm steel configuration of that generation on the steel bracelet. On the secondary market with complete documentation, it represents honest entry into certified Master Chronometer