Caliber EB 280

The Eberhard Caliber EB 280 is a hand-wound mechanical chronograph movement developed by Eberhard & Co., based on the AMT5100 / Sellita SW510 M MPC b architecture. It represents the brand’s modern interpretation of a column wheel - controlled monopusher chronograph with a flyback function, combining traditional chronograph engineering with contemporary reliability. Measuring 30.00 mm in diameter, the EB 280 features 27 jewels and operates at a frequency of 28,800 vibrations per hour (4 Hz), ensuring smooth chronograph engagement and precise timekeeping. Despite its compact dimensions, the movement offers a power reserve of approximately 62 hours, a notable achievement for a manually wound chronograph. Its column wheel mechanism governs the chronograph functions - start, stop, and reset - via a single pusher, while the flyback complication enables instant resetting and restarting of the chronograph hand without the need to stop it first, a feature particularly valued in aviation and motorsport timing. Indications include hours, minutes, and small seconds, with a central chronograph seconds hand and minute counter integrated into the chronograph train. Finishing details reflect Eberhard’s high standards, typically featuring perlage, Côtes de Genève, and blued screws. The EB 280 movement exemplifies Eberhard & Co.’s commitment to mechanical innovation, merging vintage - inspired chronograph design with the precision and durability of modern Swiss watchmaking.