1930s Longines Cal.15''' Rare 1st Flyback Chronograph Porcelain Dial With 3color-scale Design in 18K Yellow Gold

Longines, very rare 1st flyback chronograph, porcelain dial with tri-colored scales, 18K yellow gold, ø 40mm, Valjoux basedCal.15 line powered, circa mid 1930s.

It is equipped with a Valjoux-based Cal.15''', which was manufactured only for a short period of time from 1933 to 1935, when Longines transitioned from the Cal.13.33 to the Cal.13zn in-house chronograph movement. It is the world's first chronograph with a flyback function. 40mm oversized in 18 carat yellow gold, the inner and outer covers are engraved with a unique number common to the machine, and the inner cover is engraved with a unique number common to the machine. In addition, it has a beautiful porcelain dial with a three-color scale that will never fade, and it is made of high quality materials and the best of the technology of the time. You can enjoy the unique world view of vintage Longines. It is a very rare gem with historical value for Longines, which is also synonymous with flyback chronographs.