Ref. 5450: In 2005, Patek Philippe introduced the first of a series of watches with technical innovations designed to improve accuracy with the reference 5250. This watch featured a Silinvar escape wheel. Then in 2006, the ref. 5350 with Spiromax balance spring and Silinvar escape wheel. In 2008 the ref. 5450 became the third and most advanced of a trilogy with its combination of the new Pulsomax lever and escape wheel made of Silinvar and a Spiromax balance spring made of Silinvar so that all three components of the escapement are made using the new technology. The escapement is therefore completely antimagnetic. The ref. 5450 is a limited edition of 300 pieces made in platinum.

Pulsomax Escapement: The lever is made of Silinvar, a component of silica that has one-third the mass of steel, it is also of very different shape to the usual Swiss lever. The escape wheel is also made of Silinvar, this results in very low friction and eliminates the need for oil. The manufacturing process is called Deep Reactive Ion Etching (DRIE) and this enables each component to be made complete as opposed to requiring the several manufacturing processes involved in making a standard Swiss part. The DRIE process is up to 10 times more accurate than typical machining