1003

A manual-winding movement featuring hour and minute functions, 18 jewels, and 117 components, bearing the Hallmark of Geneva. Development commenced in 1952 at the L’Ile historical site, and the Calibre 1003 was unveiled in 1955 to mark the brand's bicentenary. With a diameter of 9 lignes (21.05 mm) and a height of 1.64 mm, this 120-part micromechanical achievement—comparable in size to a Swiss 20-centime coin—stands as the thinnest manual-winding mechanical movement globally, powering record-breaking 4.54 mm thick watches.