Photo by Eric Long, National Air and Space Museum (CC0 / Public Domain), via Wikimedia Commons
Lindbergh Hour Angle
The 47.5mm Hour Angle Watch, designed in 1931 by Charles Lindbergh after his transatlantic flight as a navigation aid for celestial-fix calculation. The modern L2.678.4 reference is a direct revival of the period piece, with the L699 caliber inside.
