4 penny postal stamp, unperforated trial printing in black blue gray on paper t in mixed franking with 3 Pfg and 6 Pfg - 12 Pfg postal stamps, variety \"unperforated\" on addressed cover, used \"Erford 1 30.6.46\", impeccable, photo expertize Dr. Michael Jasch BPP (2023) \"genuine and immaculate\", Michel 750.-