20 C. postal stamp, pale lilac, horizontal pair with overprint in type II, in perfect condition mint never hinged with reverse strike of the Postmark "Coudekerque business" and signatur of the post office leader as authenticity marking, only issued 80 - 100 pairs - very rare, signed Dr. Dub amongst other things and certificate with photograph autumn VP (2014) : "the condition is perfect. ", Michel 1. 400.-