This Patek Philippe Balance Staff is a must-have for any watch enthusiast who is looking to repair or replace their current staff. It is compatible with the Patek Philippe 9-90 model and is made with high-quality materials that ensure durability and longevity. The brand speaks for itself, and this balance staff is no exception. It is designed to fit perfectly with the aforementioned model and will ensure that your watch is running smoothly and accurately. Whether you are a professional watchmaker or a hobbyist, this Patek Philippe Balance Staff is a great addition to your collection.