Artist Unknown (J.L.S.): SOS to Berlin 1917. This is the only poster depicting a clack American soldier in France. S.O.S. is arguably oone of ther scarcestand most interesting posters of WWI. The white and black soldiers are depicted as equals, alas not a true picture. Pershing used black soldier mostly in construction and supply battalions. Extrememely rare. 31×46 near mint, conservation backed.