The Longines Lindbergh Hour Angle Watch is designed by no one less than Charles A. Lindbergh. He was the first person in the world to cross the North Atlantic Ocean by aircraft. Non-stop. The design is based on an improved navigation system developed by US Navy officer Philip Van Horn Weems, in 1927. Weems created a series of navigational devices that could work together with a special watch. Weems and Longines made a watch with a rotating disc that enabled the wearer to synchronize the seconds hand with a GMT signal. In fact, a radio signal. It worked, although the technique with radio beacons was in its infancy. This is where the history of the Longines Lindbergh Hour Angle Watch starts.
Crossing the North Atlantic Ocean
When crossing an ocean, there are no radio beacons. Nevertheless, Lindbergh managed to cross the Atlantic in a modified Ryan M-2 aircraft called the Ryan NYP (New York – Paris). Due to sponsoring it was called the Spirit of St. Louis. He left from Roosevelt Airfield, Long Island at the 20th of May 1927 and arrived at Le Bourget Aerodrome in Paris exactly 33 hours, 30 minutes and 29.8 seconds later. It was a miracle he managed the crossing as six earlier attempts by others ended in their death, his plane was quite rubbish and his main navigational method was good luck.
When Lindbergh got back he started to work on his system for navigation in the air, based on what Weems had developed. How it exactly works is rather complicated but basically it is a conjunction between the time, the Hour Angle hand, a sextant, a nautical almanac and calculations for longitude and altitude to determine a geographical position. This becomes a new navigational instrument that Lindbergh and Longines bring to live in a wrist watch. The Longines Lindbergh Hour Angle Watch, also known as the Longines-Wittnauer Lindbergh Hour Angle Watch.
The Hour Angle hand shows an equivalent to longitude but not in degrees but in an angular distance representing the time difference between Greenwich (GMT) and any other point on the Earth. So, somehow, if you can measure your position, with a sextant, to a certain celestial element, and you can look up where that element would be on a certain time at Greenwich and you know your own time you can calculate your longitude and latitude. More or less. To be honest, it is the closest way for us to describe how it works, but by far not accurate. For example, there is phenomenon called Equation of Time, the difference between ‘the time on Earth and the time above us’. For that the rotating bezel contains a sort of correction scale.
Now if you really want to understand it all, read Air Navigation by Philip Van Horn Weems. You can download a 1943 copy for free here. It is 442 pages. Back to the watch.
The history of the Longines Lindbergh Hour Angle Watch starts in 1931
The first Longines Lindbergh Hour Angle Watch is from 1931 and has a diameter of 47.5 millimeters. Which is a perfect size for navigation or pilot watches. It has the Longines 18.69 N.S.C. caliber, a hand-wound mechanical movement housed in a sterling silver case. This caliber is originally a pocket watch movement, like most navigation watches at that time. The dial is white with champagne. Around 2,000 pieces where produced, made by Longines and distributed in the US by Longines-Wittnauer.
Then, in 1938, Longines produced a second series of the Lindbergh. It has the same case however with the Longines 37.9 N caliber, also a mechanical hand-winder. We are not sure but it seems the dial, also white with champagne, has changed a little. On some models we found the Roman IV was changed into IIII for example. And we also found some models with a diameter of 32.5 millimeters. Perhaps versions for women as Lindbergh’s wife accompanied him many times during his flights after 1927. Which might explain why Longines re-launched 33-millimeter versions in the 1980s and 1990s.
The Longines Lindbergh Hour Angle Watch with caliber 18.69 N.S.C. from 1931 and its first successor: the Longines Lindbergh Hour Angle Watch from 1987 in steel, with reference 989.5215
After 54 years, Longines launches a successor
In 1987 the history of the Longines Lindbergh Hour Angle Watch continues. Longines produces the first commemorative edition of the Hour Angle watch, to celebrate the 60th anniversary of Lindbergh’s flight. This reference 989.5215 has a steel 38-millimeter case and the Longines L989.2 caliber, an automatic based on the L990 caliber. Some later versions of this model have the Longines L628 caliber (base ETA 2892). And this model has some variants with a steel and gold case/bezel, a full gold version (reference 989.5216) and even a 38- and 33-millimeter version in both metals. All with a white/silver or gold/silver dial.
Perhaps a lot of fans were disappointed by the size of this commemorative edition as Longines launches a 47.5-millimeter version in 1988 (reference L2.6220.127.116.11) in steel. Limited to 1,000 pieces and with the Longines L876.2 caliber (base L550). In the same year, a yellow gold version (reference L2.618.104.22.168) would follow, limited to 10 pieces.
More limited editions folow
In 1993 another two limited editions would follow, possibly called the Lindbergh Replica. 1,000 pieces of a steel version with reference 876.5238 and 100 pieces of a yellow gold version with reference 876.5239. Both models have the Longines L876.2 caliber and a 47.5-millimeter case. We also found a reference L2.600.4.11.3 with 47.5-millimeter case, limited to 1,000 pieces but this model might have been launched later than 1993. And it has an unknown manual-winding movement.
Longines also launched three 33-millimeter versions in 1993. In steel (L2.500.5.31.3), gold (L2.500.6.11.2) and one in gold with a golden bracelet (L2.500.6.11.6), whereas all previous models have a leather strap.
In 2002 Longines celebrates the 75th anniversary of the Atlantic crossing with the Longines Lindbergh 75th Anniversary Edition. Which comes with a steel case, gold case or variants of those. All with a 38-millimeter case, the Longines L614 caliber and a reference starting with L2.601. Later followed by two limited editions: 3,000 pieces for reference L2.605.4.23.2 and 1,000 pieces for reference L2.607.4.71.2.
It seems Longines celebrates the famous crossing every 5 years
Longines launches two additional editions with a 47.5-millimeter case in 2006 (reference L2.622.214.171.124 and L2.6126.96.36.199), both with the Longines L699.2 caliber. Of course, in 2007 it was the 80th anniversary, celebrated with a 47.5-millimeter yellow gold edition. Limited to 80 pieces with reference L2.6188.8.131.52. In 2012, 85 years after the flight, the reference L2.6184.108.40.206 was launched. Not limited, in steel, and very close to the original design, including a 47.5-millimeter case.
And in 2017 yet another limited edition is launched: the Longines Lindbergh Hour Angle Watch 90th Anniversary. It is limited to 90 pieces, as it is the 90th anniversary edition. It has a titanium case and a silvered dial with black center dial, also in a 47.5-millimeter case with the L699.2 automatic caliber. The reference is L2.6220.127.116.11.
The list above isn’t complete, some models have more variants. We will update the list when we have more information. If you have more details for us, please let us know!
The Longines Lindbergh Hour Angle Watch with reference L2.618.104.22.168 from 2012 in steel and the Longines Lindbergh Hour Angle Watch 90th Anniversary from 2017 with reference L2.622.214.171.124