The production of chronographs during the 40s to the 80s is very vast, most of the chronographs of this period were made by small brands more or less known. It is important to know that the brand displayed on the dial is not relevant because these brands supplied themselves with movements from very few manufacturers. Among them, the ones that stood out were Landeron, Valjoux, and Venus. This beautiful Surrex is equipped with the robust and reliable Landeron 51, a well-engineered caliber known to last in time. ________________________________________ SPECIFICATIONS Surrex Chronograph Period:1950-1959. Calibre Landeron 51, Manual. 17 Jewels. 18000 A/h 18Kt gold case Case size: 38 mm (excluding crown) Lug to lug: 45mm Thickness: 12mm Strap width: 20mm Leather strap (not original) Buckle: gold-plated metal (not original). Total weight: 46.10g White dial External tachymetric scale. Internal telemetric scale. In working order Box: no. Papers: no. Please note that as with all vintage timepieces, this watch is sold as-is. While it is currently in working order, no guarantees can be made regarding future performance or water resistance due to its age. Additionally is important to note the dent on the left side of the case, it can be seen in the last picture.