PROSKAU 2.11.1921 ZKr (OS handbook number 266.1) on C. O. D. cover with 15 Pfg dark violet horizontal pair numeral of value 1920, 5 Pfg opal green horizontal pair, 10 Pfg orange red, 60 Pfg Prussian-blue ironworks and dove to Kiel Gaarden, arrival postmark (4.11.1921), time typical traces of age and usage