IWC (International Watch Company) situated in Schaffhausen, Switzerland is known for its diving watches (the Aquatimer), piloting watches (the Big Pilot, Mark XV, and Spitfire lines), dress watches (the Portuguese and the Portofino) and complicated watches (the DaVinci, GST, & Grande Complication models). The diversity of their lines demonstrates IWC's ability to be well rounded and successful on multiple fronts.