1, 50 Fr. Postal stamp dark blue in the horizontal pair with overprint in type II, sound unused with full original gum and small rest of hinge, reverse partial cancel of the authentic Postmark from "Coudekerque business" and signatur of the post office leader as authenticity confirmation, unsigned, photo expertize Lothar Herbst VP (2017) : "the condition is perfect. Due to the small issue from only approximate 80 to 100 pairs are these stamps very rare. " Michel 1.400.-