Dial, case and movement signed, in quite good conditionDIAM: 36 mm THICKNESS: 12 mmNOTE: Longines replaced the glorious caliber 13.33Z (1913) with the new chronograph caliber more modern and less expensive from a production point of view: the 13ZN. The design and the patent (relative to the Fly-back device) dates back to 1935, while all the equipment and machinery needed for its production were built within the Longines, in 1936.