LONGINES - Stainless steel '40s-'50s Years chronograph with tachymeter scale. Case with light scratches, dial with uniform patina and slight pitting. Longines is considered a pioneer in the evolution of the chronograph. first launched in 1936, the Longines 13zn chronograph movement is still considered one of the most beautiful and technically interesting wrist chronograph movements ever produced. Designed as a flyback chronograph, the user can quickly reset the chronograph second hand to zero while still running without the need to stop it first. This avant-garde caliber affects not only collectors, but also watchmakers.