HE UER REF. 1550 SG BUNDESWEH R CHRONO STEEL Heuer, "Bundeswehr", case No. 319970, Ref. 1550 SG. Made in the 1970s. Fine, water-resistant, stainless steel military wristwatch with black bezel, round button Fly-back chronograph and register. Three body, brushed, case back with 4 screws, bidirectional revolving graduated bezel. Black with luminous Arabic numerals, outer minute/ seconds track with 5-minute/seconds Arabic markers, subsidiary seconds and 30 minutes register dials. Luminous white baton hands. Cal. 230, rhodium-plated, 17 jewels, straightline lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring.