IWC, REF. 431, B UHR, WORLD WAR II, GERMAN AIR FORCE (LUFTWAFFE).International Watch Co., movement No. 1013902, case No. 1033302, Ref. 431, request No. FL 23883. Made in 1940 for the.German Air Force, sold September 24, 1940..Very fine and extremely rare,
C. Four-body, matte gray, inclined bezel, concave lugs, large winding crown, stainless steel anti-magnetic lunette to protect the.movement against magnetic fi elds, snap-on case back, band engraved FL 23883..D. Black with luminous Arabic numerals and baton indexes, outer minute/seconds track. Luminous blued steel lozenge hands..M. Cal 52 T, gilt brass, 15 jewels, straight-line lever escapement, cut bimetallic balance, blued steel Breguet balance spring.swan neck micrometer regulator, hack mechanism..Case and movement signed. Diam. 55 mm. Thickness 17 mm.