500 Mark postage due stamp "small coat of arms from Gdansk" with Imprint-essay for the Would follow issue (Michel. No. 26 / 29) being a horizontal block of ten (5 x 2) with above dark purple and at the bottom black overprint, six stamps mint never hinged, four stamps unused, faultless, photo expertize Kniep BPP: "genuine, in best condition. " and new photo expertize Soecknick BPP: "genuine and immaculate. The very rarely overprint samples, there are the hitherto first me known such pieces, are in good condition with hinge traces on four of the upper values, all the others are mint never hinged. " it is a matter probably about one of the most spectacular uniques the complete Gdansk philately!