IWC's GST Perpetual Calendar combines the intricate workings of the caliber 79261 movement with the tough and athletic style of the GST collection. The watch was offered in both titanium and stainless steel options, with dial options in German, English, Italian, or French. It's worth noting that the language on the dial may not match the pictures provided. The IW3756-01 model features a sleek titanium case and a bold black dial.