IWC Cal 5000
This movement was introduced by IWC in 2000 and was the first new movement developed in-house since the 70s and in larger quantities. This is a truly large movement with a couple of influences drawn from their heritage: a large diameter (based on their pocket watch movements), an escapement from their famous manual wind caliber 89, and a Pellaton winding system. The IWC caliber 5000 (nowadays referred to as the 50000-calibre family) is basically a highly optimized pocket watch movement with a self-winding mechanism made for wristwatches. This movement is used in a number of IWC watch families today such as the Pilot and Portugieser. In the recent past, it was also used in some Ingenieur watches.