ZENITH Defy Extreme Diver El Primero 3620 Automatic 42.5mm Watch Heart Pendant The sleek design with a Size:7 The sleek design with a black ceramic case and bracelet features a partial open aperture black dial and gold tone dial revealing the intricate workings of the 21 jewel automatic movement and is finished with an edge to edge domed crystal This model features a stainless steel case and bezel which includes a tachymeter scale on a blue aluminium ring a timepiece designed for saturation diving with a water resistance of 600 metres and a helium escape valve it delivers a power reserve of 60 hours and the movement is visible through a sapphire display back