El Primero 4805 SK

This skeletonized iteration of Caliber 4805 integrates a tourbillon and power reserve indicator, providing at least 50 hours of power. The movement comprises 807 parts, including a chain built from 575 components, and features central hours and minutes, a 6 o'clock tourbillon carriage making one rotation per minute, a power reserve display between 4 and 5 o'clock, and a fusée-chain transmission connected to the barrel.