1945 Longines Stop Second Tre-Tacche Rare Nautical Mile Scale

Longines, Stop-Second, Tre-Tacche, rare nautical mile scale, Cal. 12.68z powered, water-resistant, circa mid-1940s. This rare piece was created for navigators at the time. The special dial features "Nautical Miles" and a scale for nautical miles, as well as rouletted Arabic indexes, discreetly laid out in-dials.? "Seconds" at 12 o'clock combined with an "O".? The case is water-resistant with a 3-point screw back type, which is rarely seen in stop-second watches and is also seen in 13zn and 3-hand models. It comes with an archival and a vintage strap that appears to be from that era.