SCHOMBERG 23.4.1920 single circle (31351) on registered letter with multiple franking 10 Pfg red orange, 20 Pfg blue vertical pair postage stamps issue 1920 to Frankfurt on M., transit postmark ZKr KRONACH 24.4.1920, arrival postmark ZKr FRANKFURT MAIN 1 27.4.1920 both at back, transport traces