18 Kreuzer dark blue, having bright colors copy, left and at the bottom well perforated - right and above with issue typically perforation faults, correctly franked single franking on cover from "Cannstatt 6 May 1862" via France to Peterborough / England (6 Kr. Postal Union 12 Kr. Forwarded franking), slight traces of age, photo expertize Irtenkauf BPP (2018) : "a neat letter, with very rare single franking and mostly clearly, contrasty additional cancellations. ", Michel 7.500.- - single frankings of this stamp become hardly ever offered!