The Patek Philippe 18K Yellow Gold Perpetual Calendar Chronograph Watch (Model 3970) is a pinnacle of horological sophistication and craftsmanship. Powered by a manual winding movement with 24 jewels and caliber 27-70, encased in its original 18k yellow gold circular case measuring 36.5mm in diameter, this timepiece exudes elegance. Its original Patek silvered dial features applied bullet indexes and subsidiary dials indicating various functions, all protected by original Patek sapphire crystal.