Longines men's automatic watch, ref. 989.5215, mod. Hour Angle Watch, designed by Col. Charles A. Lindbergh, steel/gold, circa 1991, steel case with rotating gold bezel, sapphire crystal, bicolour dial, silver-plated and gold-coloured, black Roman numerals, blackened hands, dial in the centre is rotatable for navigation purposes, spring cover on the back, reveals the movement Cal. L989.2 through a sapphire crystal, movement runs, black original leather strap with pin buckle, d. 38mm, h. 10mm