Jobin came back with the caliber 135, a 13 ligne movement (the maximum movement size that was allowed at chronometer wristwatch competitions) with an uncommon gear train arrangement. The movement features an off-center minutes/center
link wheel,
link a choice that allowed for a larger bimetallic screwed "Guillaume"balance wheel (with
link Breguet overcoil and paired with an arrow-shaped regulating index) and a larger mainspring barrel for enhanced isochronism and precision.