Michel 17 to 29 "20th Anniversary of the Republic of Poland"
20th Anniversary of the Republic of Poland. Designed by Boratynski (Michel 17 to 27), Watorek (Michel 28) and Rozwadowski (Michel 29). Available on sheets (10x10) perf 12½x12¾.
Issued 1st Apr to 5th Apr 1940. Official stamps, large format. Designed by Kreb, on sheets (10x5), Michel 1 to 12 Perf K12½, Michel 13 to 15 perf K13¾x14½.