Patek Philippe Ref. 5250 G "Advanced Research" Double sealed (On Hold)

The first chapter of a revolution. The 5250G marks Patek Philippe's inaugural use of the Spiromax hairspring, a Silinvar silicon component engineered through the DRIE process, immune to magnetism, oxidation and temperature variation, and three times lighter than a conventional spring. Where steel once defined precision, silicon now redefines it. This white gold example (1/100) arrives double sealed (never opened, never worn) and to our knowledge, fresh to the market for the very first time. For the Advanced Research collector, this is the origin. The piece that started it all.