Longines. A Large and Rare Stainless Steel Chronograph Wristwatch with Two-Tone Silvered Dial

SIGNED LONGINES, REF. 22184, MOVEMENT NO. 6'433'727, CASE NO. 87, CIRCA 1942

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Longines. A Large and Rare Stainless Steel Chronograph Wristwatch with Two-Tone Silvered Dial
Signed Longines, Ref. 22184, Movement No. 6'433'727, Case No. 87, Circa 1942
Cal. 13 ZN mechanical movement, 17 jewels, two-tone silvered dial, Arabic and baton numerals, blued steel hands, outer Arabic five minute divisions, telemeter and tachometer scale, two engine-turned subsidiary dials for 30 minute and constant seconds registers, large circular water-resistant-type case, stepped flat bezel, screw back, two round chronograph buttons in the band, case, dial and movement signed
37.5mm diam.

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Accompanied by a later Longines blue leather presentation box.

The Longines Caliber 13 ZN was the very first flyback chronograph movement made. A flyback chronograph uses a single push of a button to start, stop, and reset the chronograph function of the watch.
In 1913, Longines introduced its first caliber for a single push-piece wrist chronograph, the 13.33Z. In 1936, Longines introduced the chronograph caliber 13 ZN. Several versions were released: with either one or two push-pieces, a 30-minute semi-instantaneous counter, or a 60-minute continuous-action counter. Longines registered a patent for this caliber to protect the principle of the flyback.