HANHART German military Flyback aviation- chronograph, Germany around 1960, manual winding, later chromed steel case, screwed down case back with supply-number 6645-12-120 -4858, fluted-turning bezel, black dial with Arabic luminous numerals, original luminous hands, nickel plated movement calibre 42/51, 17 jewels, screw balance with Breguet- hairspring, diameter approx. 38 mm, needs to be overhauled, condition 2, property of a collector