40mm case diameter. Stainless steel case on stainless steel oyster band. Ceramic bezel.This GMT Master II is indeed a legend of the jet age. The original GMT-Master was embraced by airline pilots as their on-board navigation chronometer. Easily the most iconic GMT watch known, it features an arrow-tipped 24-hour hand and a 24 hour, graduated bezel for telling time in an alternate time zone. The watch was found to be running at the time of cataloguing. It has not been tested for timekeeping accuracy and may require adjustment. CODE:WRI