"German soldier pointing at viewer. 'You, too, should join the Reichswehr. Therefore, sign up at the next enlistment post, Reichswehr-Gruppen-Kommando no. 4 (Bavarian), Möhl, Major General.'" 1919

So far, I would rate German World War I posters artistically superior to those found 20+ years later. Perhaps all the best artists left (or were Jewish)?

Link.