MICHALKOWITZ 23.4.1920 ZKr (210.2) on special delivery letter with multiple franking 10 Pfg / 20 Pfg blue overprint type I a 10 single stamps provissional issue 1920 to Arkona on Ruegen, arrival postmark ZKR ARKONA (RUEGEN) 3.4.1920 at back, the cover was vertical folded, the stamps even are intact