The Omega Seamaster is a line of automatic winding mechanical diving watches from Omega with a history that can be traced back to the original water-resistant dress-style watch released in 1948. The Seamaster collection is perhaps best known today for the Seamaster Diver Professional 300m model that has been worn in the James Bond movie franchise since 1995. Originally conceived as a dressy, water-resistant timepiece, the Omega Seamaster has evolved to a robust sports watch line, typically with a stainless steel case, robust water resistance, and an official chronometer-certified movement within. The Diver Professional 300m is most famous for its "train-track" five link steel bracelet, its helium release valve at the 10:00 position, the wave pattern dial on certain model generations, and the skeletonized handset.