Longines diver Ultronic Ref. 8484-4Born in the heart of the Quartz Revolution of the 1970s, the Longines Ref. 8484 4 stands as a fascinating witness to one of the most transformative chapters in watchmaking history. During the so called Quartz War, Swiss manufactures faced the rise of electronic precision, and Longines responded with bold innovation. At its core beats the Bulova derived Caliber 6312 tuning fork movement, a remarkable electro mechanical caliber that uses a vibrating