This 1st generation GMT-Master II ref. 116710BLNR was the first Rolex to sport the two-toned (blue/black) Cerachrom 24-hour bezel, allowing you to read multiple time-zones simultaneously. With demand growing ever stronger for the original Batman, this is definitely one to consider for the collection. Powered by Rolex's self-winding dual-time calibre 3186 movement, waterproof to 100m and presented totally complete, including both swing tags, and its Rolex warranty card dated October 2018.