1933 GERMANY-Cover to Poto Alegra, Brazil with Air 50pf orange and Zeppelin Chicago Flight 1RM red tied oval Frankfurt-Basel Bahnpost Z 297 12.10.33 cancel, red triangular OZEANUBERQUERUNG cachet, Porto Alegreir backstamp, attractive and fine, stamp cat £600 [US4] (Start Price = £122.40) (Image)