Caliber 281

The Universal Genève Caliber 281 is a manual-winding column-wheel chronograph movement produced by Universal Genève during the mid-20th century, representing one of the most iconic mechanisms in vintage chronograph history. Developed as part of the brand’s renowned family of column-wheel calibers - including the 283, 285, and 287 - it formed the technical backbone of the Compax and Tri-Compax lines. Measuring 28.5 mm in diameter and 7.10 mm in height, Caliber 281 beats at 18,000 vibrations per hour (2.5 Hz) and delivers a power reserve of approximately 36 hours. It employs a horizontal clutch system paired with a column-wheel control mechanism, offering precise, smooth chronograph actuation. Functions include hours, minutes, small seconds, central chronograph seconds, 30-minute, and 12-hour counters. True to Universal Genève’s mid-century standards, finishing includes anglage on the bridges, circular graining on the main plate, and blued screws, showcasing fine Swiss craftsmanship. Extensively used in the brand’s chronographs from the 1950s and 1960s, the Caliber 281 is prized today for its compact proportions, robust architecture, and silky pusher feel - qualities that make it one of the most celebrated hand-wound chronograph movements of its era.