1, 50 franc postal stamp, blue, horizontal pair with overprint in type II, impeccable mint never hinged with reverse strike of the Postmark \"Coudekerque business\" and signatur of the post office leader as authenticity marking, issued only 80 - 100 pairs - very rare, expertized Tust BPP and expertise Lothar Herbst VP (2023) : \"the condition is perfect. \", Michel 2.500.-