1940 Longines Cal.12.68z "Stop Second" GF with Rare Two-Tone Breguet Tachymetre Dial

Longines, "Stop Seconds" model,? Cal. 12.68z powered, 10K Yellow Gold Filled case, a very rare silver-colored tachymeter dial with Breguet indexes circa 1940.? A very rare two-tone dial with a tachymeter scale in the outer circumference and Breguet indexes laid out in the center of the dial, which is very rare in Gold Filled material stop seconds, where simple designs are often seen. The case is small at 31mm in diameter, but with the case's massive cylinder case with a rounded back. It is a rare example of well balanced and condensed design and has a wonderful presence that exceeds its size. It is powered by the famous Caliber 12.68z, which is available in many variations, including small seconds, central seconds, and a simple chronograph. It comes with a genuine leather strap and a buckle from a later year.