German Reich 1934, sugar Rockets flight Thale, cover franked by 12 Pfg t_t_-b_che pair Fridericus, on face Raketenvignette 6A3b (color error red / silver - from this are only 8 pieces recorded!) and reverse horizontal unperforated t_t_-b_che pair to 3 Mark (black / silver), black special cancellation "rocket assisted takeoff THALE / Harz Mountains", as air mail letter over Berlin two-line cancel to Hamburg-Fühlsbüttel, accordingly red confirmation stamp, very scarce combination rocket post / airmail, in this kind probably the only one exists