50 C. Mercury head, horizontal pair with overprint in Type II and right-hand margin with blank space in stamp size, on the reverse, as is often the case, the "Coudekerque-Branche" postmark is applied, mint never hinged, flawless condition, edition of only 1,500 pairs - of which only about 300 with margin are possible - most of these issued stamps were used for postage, mint examples with margin are rare, signed Brun and expertise by Lothar Herbst VP (2024) "The condition is flawless.", Michel 1,800.-