1931/35, Paraguay, Air Post
Five sets on the voyage of Zeppelin in South America, overprinted two values (Yv. 44/45); five values (Yv. 51/55); five values (Yv. 63/67); overprinted “1934” five values (Yv. 67A/67E); overprinted “1935” five values (yv. 76/80), all new mounted mint.