This watch is accompanied by a Longines wooden presentation box, Certificate of Origin, instruction manual and outer packaging.
The hour angle watch was invented by the renowned American aviator, Charles A. Lindbergh and introduced to the market in 1932. Lindbergh rose to international fame in 1927 when he became the first person to make a solo, non-stop Trans-Atlantic flight.
As the accuracy of mechanical watches can be affected by conditions aboard ships and airplanes, the hour angle watch provided a means by which this variation could be readily calculated when used in conjunction with radio time signals.
This watch was produced in 1987 to commemmorate the 60th anniversary of Lindbergh's famous flight. It is smaller in diameter than the original model, however the complications function in the same manner.