*NOS* 1970s Longines Ultra-Chron | Ref. 7851-1 | Hi-Beat 36000 | Cal.431

WHY IS THIS WATCH IMPORTANT The narrative behind the Longines Ultra-Chron timepieces dates back to the late 1960s. The aim was to compete with the likes of Girard-Perregaux and Seiko, who had only just introduced watches with high-frequency movements. The Longines Ultra-Chron movement boasts an impressive 36,000 vibrations per hour, a revolutionary feat at the time, delivering superior chronometric precision. Accordingly, Longines advertisements proudly proclaimed the Ultra-Chron as the "most precise watch in the world." This particular iteration of the Longines "Ultra Chron" boasts an elegant, unibody case with a slender, pillow-shaped design and an outer diameter of approximately 33mm. Its dial features a refined silver sunburst finish, complemented by thin, raised indices in black and polished steel. The time is indicated by polished steel stick-shaped hands, delicately accented with a black inlay. Finally, a practical date window is conveniently positioned at the 3 o'clock mark. T