4 Pfg on 3 7 Pfg Postal service congress with overprint error I along with 20 30 Pfg and 60 on 6 Pfg, latter with overprint error III, on correctly franked registered cover from "STRAUSBERG 30.3.36" to Berlin with arrival postmark, in perfect condition, rare, and associated with the both overprint errors especially delightful cover, expertized Sturm BPP, Michel 300.- already for lots