Patek was only the first brand using the Silinvar alloy in its escapement, they never claimed to be the first one to use Silicon.
It is not
the alloy used by UN if I remember well. They went for another type of
Silicon-based material.
UN has also been pushing forward the developpement of its first attempts with the diamond coating treatment later on, to improve a perfectible reliability.
I think it was 2001 for the first Freak and 2005 to 2007 for the improved Silicon and diamond technics escapements.
However, the point of this date to remember is just that it has been 10 years already since Patek launched the project and I think it is quite an interesting step for the brand.
Cheers, Mark
This message has been edited by Mark in Paris on 2015-04-18 16:21:08