Watch connoisseurs can identify an A. Lange & Söhne movement at first sight. Each component is decorated with its own specific type of finissage, whether or not it is visible through the sapphire-crystal caseback. No matter how small it might be, each part must comply with rigorous artisanal and aesthetic standards. It takes several months of practice just to perfectly execute a flat polished finish, while in chamfering, great emphasis is placed on assuring that the edges are not only bevelled to the same angle but also to the same width. A special type of finish is reserved for the balance cock: it is engraved with the Lange-style floral pattern that makes each Lange watch unique.