Mid-20th century Longines stainless steel chronograph wristwatches represent a remarkably collectible category of timepieces, both in virtue of their aesthetics, and of their technical proficiency as well. They are known both for their rugged masculine appeal and extraordinary caliber 13ZN movement. Introduced in 1936, the 13ZN was a large movement with flyback mechanism allowing the wearer to reset the watch without stopping it. This feature was particularly useful in aviation when dead reckoning flying was required. Watches from this period were offered in cases ranging from 34mm to 38mm, and with snap on backs like the present watch or screw down cases.

The present example features a very contemporary (and actually oversize for the time) case with a 37mm diameter. The entire piece is preserved in exceptional and absolutely original condition. The luminous material has severely darkened with age, amplifying both the vintage feeling and - a lucky "additional bonus" - the legibility of the watch. The deep warm patina that has developed on the surface of the dial is the perfect complement to the numerals, the final ensemble representing a superb, unrestored and extremely well preserved of the mythical "13 ZN".