50 C. Merkur head, horizontal pair with overprint in type II and right attached blank field in stamp size, reverse like often as usual the cancel "Coudekerque business" mounted, mint never hinged, faultless condition, issued only 1.500 pairs - of it only approximate 300 with blank field possible - the most of this denomination value issued stamp were for frankings used, mint never hinged blank field units are rare, signed Brun and expertise Lothar Herbst VP (2024) "the condition is perfect. ", Michel 1.800.-