20 Heller postal stamp in coil perforation with overprint "we are free! Plus swastika", horizontal strip of four, in perfect condition mint never hinged, largest known unit thus unique the anyway already rarely stamp, expertized Dr. Dub and expertise Brunel VP (2021) : "the condition is perfect. Another strip of four respectively a larger unit have up to now not produced. ", Michel 3.600.- free of premium for the scarce unit!