Official letter of Imperial German Consulate Chicago Illinois, carried on 2nd return voyage of submarine Deutschland, Foreign Office seal and sealing label on reverse, front L1 Reichsdienstsache and L2 Deutsche Ozean Rederei plus BERLIN handover mark, postage-free registered delivery to recipient, FRANKFURT (MAIN) 1 arrival, Günter Wagner BPP certificate (2026): "Condition faultless apart from vertical crease.", Mi. 12000,-