Prison Hamburg-Fuhlsbüttel: 1938, franked local letter from Hamburg 1 6. 5. 38 at a Prisoner (no. 5649), complete with contents (2 pages), cover and contents in each case with censorship double-line cancel "cover censorship H. H. F. 6. 6. 1938" and label "the covers must always. . . . Undelivered" on a page