Longines Lindberg Spirit Hour Angle automatic men's wristwatch, the gilded and silvered dial display simultaneously showing time and longitude, the mobile inner dial showing the seconds which can be rotated by means of the crown. Stitched leather strap, in original presentation box with all booklets and map showing 'Lindberg's Flight'. Working order. Note: this model introduced in 1987 by Longines pays homage to their original 1937 design used as a navigational and piloting aid made possible by the rapid determination of the Greenwich hour angle, i.e., longitude.