50 K. with printing on the rauhen Paper back and inverted overprint! as issued unused without gum, in type I from of the right upper corner of the sheet (field 5) ! issued only 15 piece! an extremely rare stamp, signed Z. Mikulski and photo expertize Gerhard Krischke BPP (1983, here is the stamp still as 4 IK catalogued) : " the condition is perfect. ", Michel 3.500.-