this is the first mass production watch with coaxial escapement
欧米茄(omega seamaster escapement,aqua terra 150 m co-axial
后面是seamaster aqua terra co-axial escapement 150m/500ft
m/4,000ft"ploprof"及"omega 8500 co-axial escapement"的黑色字样
欧米茄的8800机芯怎么样欧米茄的表为什么这么准