6 shillings, perforated, Berliner reprint 1879, IIIth impression, compl. sheet to 50 stamps, the plate errors described in the cabbage manual in the fields 18, 20 and 41 as well as the new engrave of the right inscription "HELIGOLAND" on field 23. The once vertically and horizontally trace of folding to three places with hinges supported by the perforation, back (43 mint never hinged stamps). A rare and interesting piece with a museum character