Screw-down tri-lock crown is specifically designed for diving watches. It is developed by Rolex and is applied to other professional occasion. This system is waterproof to 300 meters. The official information say that it has 100 meters of water-resistance, but after out test, it reaches 300 meters. Whatever 100 meters or 300 meters, we should have confidence on Rolex Oyster case. The bracelet is pieces-link that was rolled out in 1930s, and it is made of three lines of flat links, which is solid. Oyster has been widely applied to Rolex watches. 904 L stainless steel builds a sophisticated case that is anti-corrosion.

On the anti-scratching sapphire mirror there is a date aperture at 3 o’clock that has a lens on it. The hour hands here are made of 18k white gold, and most arresting is the blue hand at second time zone. The triangular luminous hands. With the 24 hour ceramic bezel it is perfect. The case back is sealed and the Rolex-developed 3186 automatic winding movement is set on it. In addition to the hour, minute and second hands, it is fitted with a 24 hour hand that could display the second time zone. Fitting with the Parachrom hairspring, it could effectively avoid the influences from shock or changes on temperature. The structure on it is same to other Oyster movements that is reliable. 

Rolex GMT II is practical and is enough for daily use, and Rolex tries its best to make it perfect. You can go to any occasion with it, but fitting with a suite would be more serious. Black-blue ceramic bezel and the blue second time zone is refreshing, comparing to the old, tedious design and I guess that why fans are after it. And if you want to have your own Rolex GMT II watches with lower price, why not considering the knock off rolex online?