In 1933 the technical department of the German Aviation Ministry (RLM: Reichs-Luftfahrtministerium) tested the hour angle watch of
Longines based on developments by Weems and Lindbergh.
See the att. spec Luftwaffe document of the ‘Zeitwinkeluhr’ with 180° dial and 47,5 mm diameter (Fl 22604 of 1933) imported by Paul Baumeister Berlin.
At least the German Aviation Ministry changed the specs for the wrist watch to 55mm diameter for better…