1931-34, Four better covers (3 FFCs) incl. August 1931 Windhoek to Omaruru and another reg’d to Otjiwarongo, Dec. 1931 Windhoek to Kimberly, and same from March 1934 (non-FFC) with Magdeburg as final destination, all with partial airmail frankings, very fine group (Mü. 7 [x 2], 10, etc.) (Image)