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LONGINES MILESTONES SUPPORTING PIONEERS AND PILOTS

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This is a collection of some pioneering timepieces made by Longines, specially engineered and designed for explorers, pioneers and pilots as well as for timekeeping tasks. Longines was the first watch manufacturer to introduce the flyback chronograph or the central minute counter - and protected these developments by patents.
First wrist chronograph, 1913
Longines column-wheel manual movement cal. 13.33Z, with 30-minute counter on an auxiliary dial and single-button crown, precise to 1/5 of a second. Model from 1919. Longines started to produce this calibre in 1913.
Longines Pilot's watch (ref. 3796), 1936
Oversized pilot’s wristwatch (47.5 mm), Longines manual movement cal. 18.69N, concentric disk calibrated to seconds to synchronise with a radio time signal, four-body steel case, bidirectional revolving bezel to indicate the elapsed time. Similar to the Weems Second-Setting Watch from 1929, with inner rotating disc. This model dates to 1936.
Lindbergh Hour Angle Watch (ref. 3210), 1931
Oversized stainless steel pilot’s hour angle wristwatch for navigation, four-body case, silver revolving bezel calibrated to 15 degrees in blue enamel, diameter 47 mm, Longines manual movement cal. 18.69N. Inner rotating disk calibrated to 60 seconds and 15 degrees. Model from 1938, production started in 1931. First watch with rotating bezel.
Longines Weems New Second-Setting watch (ref. 4036), patented in 1935
“U.S. Pat. 2008734”, referring to Philip Van Horn Weems’ original registration (filled in 1929) to patent his design for a pilot’s navigational aid, known as a “second-setting” watch. This was the first wristwatch with turning bezel graduated to 60 seconds to synchronise with the radio time signal. This model with a 34 mm case dates to 1937, Longines manual movement cal. 11.68Z.
Longines Flyback- wrist chronograph (ref. 3770), 1935
The world’s first patented chronograph with flyback function. From 1936 equipped with Longines cal. 13ZN. Three-body case in 18K gold, 39.5 mm diameter, two-tone silvered sector dial, red telemeter scale, concentric tachymeter scale, two subsidiary dials for 30-minute register and constant seconds.
Longines wrist chronograph with Central Minute Counter (ref. 5699), patented in 1942
Oversized Chronograph (39.5 mm) with long red central minute register hand (patented in 1942), Longines manual movement cal.  13ZN  12, two-body waterproof case, screw back case, matte silvered dial, 1/5 of a second scale, outer blue telemeter scale, inner blue tachymeter scale, luminous blue steel hands, two subsidiary dials representing 12-hour register and constant seconds, manufactured in 1945.
Longines Pilot’s wrist chronograph with starting time indicator (ref. 3811), 1937
Single-button chronograph with 30-minute register and constant seconds, Longines manual movement cal. 13ZN with column-wheel, black dial with large luminous numerals and hands, rotating bezel with luminous triangular arrow for clear visibility during night flights, manufactured in 1937.
Longines High-Frequency Split-Second Chronograph for Timekeeping (ref. 7411), 1966
Split-second chronograph counter (66 mm), large crown for start, stop and reset; split-second push button at 11. High-frequency movement ticking at 36,000 beats per hour (Longines manual movement cal. 262), Vernier scale to indicate 1/10 sec, subsidiary dials for the 30-minute register and constant seconds. Production of a high-frequency (36,000 beats per hour), 24 lines chronograph started in 1939/40. This model was produced in 1966.
Summary