1940s Longines Cal.13zn 37mm Calatrava Flyback Chronograph Very Rare Black Unique Dial

This is a very rare black unique dial with a big Calatrava design flyback chronograph with Longines' famous Cal. 13zn.The rare black dial has a very unique design with bars at 12 and 6 o'clock and Arabic indexes in a roulette pattern on the other parts of the dial. The 37mm Calatrava case with its beautiful flat bezel has a massive structure that is unique to Longines even though it is not water-resistant, and it is equipped with the in-house Cal. 13zn with flyback function as standard. It is a wonderful gem. Longines' in-house caliber chronographs are perfectly established masterpieces in the history of watchmaking and will continue to be appreciated and handed down. Comes with the archive.