Heuer 1550 SG

HEUER flyback-intermediate wheel chronograph of the German Army supply-no. 6645-12-146-3774 / 6645-12-340-9456 reference 1550 SG, Switzerland around 1968, manual winding, 4- times screwed down monocoque-case in steel with blackened revolving bezel, case back with supply number, black dial with Arabic luminous numerals, original luminous hands, rhodium plated movement calibre Valjoux 230, 17 jewels, second-stop at hand-setting, diameter approx. 43 mm, condition 2, property of a collector