WOINOWITZ 12.12.1920 single circle (OS handbook number 364.1) on registered letter with 5 Pfg on 20 Pfg Prussian-blue overprint type III b, 5 Pfg on 20 Pfg blue overprint type IV a double impression provissional issue 1920, 80 Pfg purple brown ironworks and dove 1920 to Ratibor, arrival postmark (14.12.1920) at back, time typical traces of age and usage, abridged certificate Gruber BPP (2002)