Calibre Family 89000
The chronograph movements from the 89000-calibre family are based on the Pellaton pawl-winding system, which has been constantly modified and improved for different purposes over the years. The 89360 and 89361 calibres made it possible for IWC to develop a chronograph display that enables stopped hours and minutes to be read off as easily as the time of day. In the 89802 calibre, four winding pawls instead of two transfer the energy generated by the rotor movement and increase its efficiency by 30 per cent. The movement consists of 474 individual parts and builds up a power reserve of up to 68 hours. The calibre family was further refined for the 89800 calibre, which is used for the big digital date and month displays.