5 Pfg. on 15 Pfg. dark violet (overprint variety) with overprint type "IVa", unused extremely fine copy, signed Dr. Müller and certificate with photograph Gruber BPP: ". . . . Is extremely rare, genuine and in perfect quality",! For a piece with perforation faults obtained we in an of our last auctions over 600.- Euro plus percentage of bid price! Provenance collection professor urban !