Omega gents speedmaster 57 omega co axial chronograph 415 mm having been a part of all six lunar missions the legendary speedmaster is an impressive representation of the brands adventurous pioneering spiritsteel on steel movement self winding chronograph power reserve 60 hours case steeldial blackwater resistance 10 bar 100 metres 330 feetsize case diameter 415 mmfeatureschronographchronometertachymeter