25 C. Postal stamp blackish opal green, horizontal pair with overprint in type II, reverse as usual partial cancel of the Postmark \"Coudekerque business\" as authenticity marking, in perfect condition unused, photo expertize Lothar Herbst VP (2017) : \"the preservation is perfect. Due to the small issue from only approximate 80 - 100 pairs are these stamps very rare. \" Michel 1.400.-